diff --git a/docshell/base/nsDocShellTreeOwner.cpp b/docshell/base/nsDocShellTreeOwner.cpp
index 58cefea1650f..4136f4c6672f 100644
--- a/docshell/base/nsDocShellTreeOwner.cpp
+++ b/docshell/base/nsDocShellTreeOwner.cpp
@@ -402,7 +402,10 @@ nsDocShellTreeOwner::SizeShellTo(nsIDocShellTreeItem* aShellItem,
       shellAsWin->GetSize(&width, &height);
       return tabChild->RemoteSizeShellTo(aCX, aCY, width, height);
     }
-    return webBrowserChrome->SizeBrowserTo(aCX, aCY);
+    // XXX: this is weird, but we used to call a method here
+    // (webBrowserChrome->SizeBrowserTo()) whose implementations all failed
+    // like this, so...
+    return NS_ERROR_NOT_IMPLEMENTED;
   }
 
   NS_ENSURE_TRUE(aShellItem, NS_ERROR_FAILURE);
@@ -430,12 +433,10 @@ nsDocShellTreeOwner::SizeShellTo(nsIDocShellTreeItem* aShellItem,
     presShell->ResizeReflow(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
     NS_ERROR_FAILURE);
 
-  nsRect shellArea = presContext->GetVisibleArea();
-
-  int32_t browserCX = presContext->AppUnitsToDevPixels(shellArea.Width());
-  int32_t browserCY = presContext->AppUnitsToDevPixels(shellArea.Height());
-
-  return webBrowserChrome->SizeBrowserTo(browserCX, browserCY);
+  // XXX: this is weird, but we used to call a method here
+  // (webBrowserChrome->SizeBrowserTo()) whose implementations all failed like
+  // this, so...
+  return NS_ERROR_NOT_IMPLEMENTED;
 }
 
 NS_IMETHODIMP
@@ -495,7 +496,10 @@ nsDocShellTreeOwner::Destroy()
 {
   nsCOMPtr<nsIWebBrowserChrome> webBrowserChrome = GetWebBrowserChrome();
   if (webBrowserChrome) {
-    return webBrowserChrome->DestroyBrowserWindow();
+    // XXX: this is weird, but we used to call a method here
+    // (webBrowserChrome->DestroyBrowserWindow()) whose implementations all
+    // failed like this, so...
+    return NS_ERROR_NOT_IMPLEMENTED;
   }
 
   return NS_ERROR_NULL_POINTER;
diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index 329f0f0eaab3..d26e98928349 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -734,14 +734,6 @@ TabChild::SetChromeFlags(uint32_t aChromeFlags)
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-NS_IMETHODIMP
-TabChild::DestroyBrowserWindow()
-{
-  NS_WARNING("TabChild::DestroyBrowserWindow not supported in TabChild");
-
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
 NS_IMETHODIMP
 TabChild::RemoteSizeShellTo(int32_t aWidth, int32_t aHeight,
                             int32_t aShellItemWidth, int32_t aShellItemHeight)
@@ -798,14 +790,6 @@ TabChild::RemoteDropLinks(uint32_t aLinksCount,
   return sent ? NS_OK : NS_ERROR_FAILURE;
 }
 
-NS_IMETHODIMP
-TabChild::SizeBrowserTo(int32_t aWidth, int32_t aHeight)
-{
-  NS_WARNING("TabChild::SizeBrowserTo not supported in TabChild");
-
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
 NS_IMETHODIMP
 TabChild::ShowAsModal()
 {
diff --git a/toolkit/components/browser/nsIWebBrowserChrome.idl b/toolkit/components/browser/nsIWebBrowserChrome.idl
index d7b995b4c200..df9a36590c73 100644
--- a/toolkit/components/browser/nsIWebBrowserChrome.idl
+++ b/toolkit/components/browser/nsIWebBrowserChrome.idl
@@ -97,20 +97,6 @@ interface nsIWebBrowserChrome : nsISupports
      */
     attribute unsigned long chromeFlags;
 
-    /**
-     * Asks the implementer to destroy the window associated with this
-     * WebBrowser object.
-     */
-    void destroyBrowserWindow();
-
-    /**
-     * Tells the chrome to size itself such that the browser will be the
-     * specified size.
-     * @param aCX new width of the browser
-     * @param aCY new height of the browser
-     */
-    void sizeBrowserTo(in long aCX, in long aCY);
-
     /**
      * Shows the window as a modal window.
      */
diff --git a/xpfe/appshell/nsAppShellService.cpp b/xpfe/appshell/nsAppShellService.cpp
index d73c28caaee1..66c4ba1323aa 100644
--- a/xpfe/appshell/nsAppShellService.cpp
+++ b/xpfe/appshell/nsAppShellService.cpp
@@ -268,22 +268,6 @@ WebBrowserChrome2Stub::SetChromeFlags(uint32_t aChromeFlags)
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-NS_IMETHODIMP
-WebBrowserChrome2Stub::DestroyBrowserWindow()
-{
-  MOZ_ASSERT_UNREACHABLE("WebBrowserChrome2Stub::DestroyBrowserWindow is "
-                         "not supported");
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
-NS_IMETHODIMP
-WebBrowserChrome2Stub::SizeBrowserTo(int32_t aCX, int32_t aCY)
-{
-  MOZ_ASSERT_UNREACHABLE("WebBrowserChrome2Stub::SizeBrowserTo is "
-                         "not supported");
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
 NS_IMETHODIMP
 WebBrowserChrome2Stub::ShowAsModal()
 {
diff --git a/xpfe/appshell/nsContentTreeOwner.cpp b/xpfe/appshell/nsContentTreeOwner.cpp
index a3f37a6322ac..a1ffaf755831 100644
--- a/xpfe/appshell/nsContentTreeOwner.cpp
+++ b/xpfe/appshell/nsContentTreeOwner.cpp
@@ -483,18 +483,6 @@ NS_IMETHODIMP nsContentTreeOwner::GetChromeFlags(uint32_t* aChromeFlags)
   return mXULWindow->GetChromeFlags(aChromeFlags);
 }
 
-NS_IMETHODIMP nsContentTreeOwner::DestroyBrowserWindow()
-{
-   NS_ERROR("Haven't Implemented this yet");
-   return NS_ERROR_FAILURE;
-}
-
-NS_IMETHODIMP nsContentTreeOwner::SizeBrowserTo(int32_t aCX, int32_t aCY)
-{
-   NS_ERROR("Haven't Implemented this yet");
-   return NS_ERROR_FAILURE;
-}
-
 NS_IMETHODIMP nsContentTreeOwner::ShowAsModal()
 {
    NS_ENSURE_STATE(mXULWindow);