diff --git a/widget/windows/nsIMM32Handler.cpp b/widget/windows/nsIMM32Handler.cpp
index 45a5ad937d39..944a1dcbc5ab 100644
--- a/widget/windows/nsIMM32Handler.cpp
+++ b/widget/windows/nsIMM32Handler.cpp
@@ -462,7 +462,7 @@ nsIMM32Handler::OnInputLangChange(nsWindow* aWindow,
     ("IMM32: OnInputLangChange, hWnd=%08x, wParam=%08x, lParam=%08x\n",
      aWindow->GetWindowHandle(), wParam, lParam));
 
-  aWindow->ResetInputState();
+  aWindow->NotifyIME(REQUEST_TO_COMMIT_COMPOSITION);
   NS_ASSERTION(!mIsComposing, "ResetInputState failed");
 
   if (mIsComposing) {
diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
index eb0e48757e14..27e0edd095a6 100644
--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -6859,7 +6859,7 @@ LRESULT nsWindow::OnChar(const MSG &aMsg,
   }
 
   if (IMEHandler::IsComposingOn(this)) {
-    ResetInputState();
+    IMEHandler::NotifyIME(this, REQUEST_TO_COMMIT_COMPOSITION);
   }
 
   wchar_t uniChar;
@@ -7360,9 +7360,10 @@ nsWindow::OnSysColorChanged()
  **************************************************************
  **************************************************************/
 
-NS_IMETHODIMP nsWindow::ResetInputState()
+NS_IMETHODIMP
+nsWindow::NotifyIME(NotificationToIME aNotification)
 {
-  return IMEHandler::NotifyIME(this, REQUEST_TO_COMMIT_COMPOSITION);
+  return IMEHandler::NotifyIME(this, aNotification);
 }
 
 NS_IMETHODIMP_(void)
@@ -7386,11 +7387,6 @@ nsWindow::GetInputContext()
   return mInputContext;
 }
 
-NS_IMETHODIMP nsWindow::CancelIMEComposition()
-{
-  return IMEHandler::NotifyIME(this, REQUEST_TO_CANCEL_COMPOSITION);
-}
-
 NS_IMETHODIMP
 nsWindow::GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState)
 {
@@ -7402,13 +7398,6 @@ nsWindow::GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsWindow::OnIMEFocusChange(bool aFocus)
-{
-  return IMEHandler::NotifyIME(this, aFocus ? NOTIFY_IME_OF_FOCUS :
-                                              NOTIFY_IME_OF_BLUR);
-}
-
 NS_IMETHODIMP
 nsWindow::OnIMETextChange(uint32_t aStart,
                           uint32_t aOldEnd,
@@ -7417,12 +7406,6 @@ nsWindow::OnIMETextChange(uint32_t aStart,
   return IMEHandler::NotifyIMEOfTextChange(aStart, aOldEnd, aNewEnd);
 }
 
-NS_IMETHODIMP
-nsWindow::OnIMESelectionChange(void)
-{
-  return IMEHandler::NotifyIME(this, NOTIFY_IME_OF_SELECTION_CHANGE);
-}
-
 nsIMEUpdatePreference
 nsWindow::GetIMEUpdatePreference()
 {
diff --git a/widget/windows/nsWindow.h b/widget/windows/nsWindow.h
index 9499902df4c6..b0993dc5f461 100644
--- a/widget/windows/nsWindow.h
+++ b/widget/windows/nsWindow.h
@@ -163,11 +163,10 @@ public:
                                                            double aDeltaZ,
                                                            uint32_t aModifierFlags,
                                                            uint32_t aAdditionalFlags);
-  NS_IMETHOD              ResetInputState();
+  NS_IMETHOD              NotifyIME(NotificationToIME aNotification) MOZ_OVERRIDE;
   NS_IMETHOD_(void)       SetInputContext(const InputContext& aContext,
                                           const InputContextAction& aAction);
   NS_IMETHOD_(InputContext) GetInputContext();
-  NS_IMETHOD              CancelIMEComposition();
   NS_IMETHOD              GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState);
   NS_IMETHOD              RegisterTouchWindow();
   NS_IMETHOD              UnregisterTouchWindow();
@@ -176,9 +175,7 @@ public:
   virtual nsTransparencyMode GetTransparencyMode();
   virtual void            UpdateOpaqueRegion(const nsIntRegion& aOpaqueRegion);
 #endif // MOZ_XUL
-  NS_IMETHOD              OnIMEFocusChange(bool aFocus);
   NS_IMETHOD              OnIMETextChange(uint32_t aStart, uint32_t aOldEnd, uint32_t aNewEnd);
-  NS_IMETHOD              OnIMESelectionChange(void);
   virtual nsIMEUpdatePreference GetIMEUpdatePreference();
   NS_IMETHOD              GetNonClientMargins(nsIntMargin &margins);
   NS_IMETHOD              SetNonClientMargins(nsIntMargin &margins);
diff --git a/widget/windows/winrt/MetroWidget.cpp b/widget/windows/winrt/MetroWidget.cpp
index ed201e7340a6..71b4ee17c4c7 100644
--- a/widget/windows/winrt/MetroWidget.cpp
+++ b/widget/windows/winrt/MetroWidget.cpp
@@ -1152,18 +1152,26 @@ MetroWidget::GetInputContext()
 }
 
 NS_IMETHODIMP
-MetroWidget::ResetInputState()
+MetroWidget::NotifyIME(NotificationToIME aNotification)
 {
-  nsTextStore::CommitComposition(false);
-  return NS_OK;
-}
-
-
-NS_IMETHODIMP
-MetroWidget::CancelIMEComposition()
-{
-  nsTextStore::CommitComposition(true);
-  return NS_OK;
+  switch (aNotification) {
+    case REQUEST_TO_COMMIT_COMPOSITION:
+      nsTextStore::CommitComposition(false);
+      return NS_OK;
+    case REQUEST_TO_CANCEL_COMPOSITION:
+      nsTextStore::CommitComposition(true);
+      return NS_OK;
+    case NOTIFY_IME_OF_FOCUS:
+      return nsTextStore::OnFocusChange(true, this,
+                                        mInputContext.mIMEState.mEnabled);
+    case NOTIFY_IME_OF_BLUR:
+      return nsTextStore::OnFocusChange(false, this,
+                                        mInputContext.mIMEState.mEnabled);
+    case NOTIFY_IME_OF_SELECTION_CHANGE:
+      return nsTextStore::OnSelectionChange();
+    default:
+      return NS_ERROR_NOT_IMPLEMENTED;
+  }
 }
 
 NS_IMETHODIMP
@@ -1174,13 +1182,6 @@ MetroWidget::GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-MetroWidget::OnIMEFocusChange(bool aFocus)
-{
-  return nsTextStore::OnFocusChange(aFocus, this,
-                                    mInputContext.mIMEState.mEnabled);
-}
-
 NS_IMETHODIMP
 MetroWidget::OnIMETextChange(uint32_t aStart,
                              uint32_t aOldEnd,
@@ -1189,12 +1190,6 @@ MetroWidget::OnIMETextChange(uint32_t aStart,
   return nsTextStore::OnTextChange(aStart, aOldEnd, aNewEnd);
 }
 
-NS_IMETHODIMP
-MetroWidget::OnIMESelectionChange(void)
-{
-  return nsTextStore::OnSelectionChange();
-}
-
 NS_IMETHODIMP
 MetroWidget::ReparentNativeWidget(nsIWidget* aNewParent)
 {
diff --git a/widget/windows/winrt/MetroWidget.h b/widget/windows/winrt/MetroWidget.h
index d12795bc8be9..0d55d34aafa5 100644
--- a/widget/windows/winrt/MetroWidget.h
+++ b/widget/windows/winrt/MetroWidget.h
@@ -126,12 +126,9 @@ public:
   NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
                                     const InputContextAction& aAction);
   NS_IMETHOD_(nsIWidget::InputContext) GetInputContext();
-  NS_IMETHOD    ResetInputState();
-  NS_IMETHOD    CancelIMEComposition();
+  NS_IMETHOD    NotifyIME(NotificationToIME aNotification) MOZ_OVERRIDE;
   NS_IMETHOD    GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState);
-  NS_IMETHOD    OnIMEFocusChange(bool aFocus);
   NS_IMETHOD    OnIMETextChange(uint32_t aStart, uint32_t aOldEnd, uint32_t aNewEnd);
-  NS_IMETHOD    OnIMESelectionChange(void);
 
   // FrameworkView helpers
   void SizeModeChanged();