Bug 1456169 part 3. Remove the now-unnecessary nsITextControlElement::GetPreviewNode. r=emilio

MozReview-Commit-ID: 3goF5VXvQap

dom/html/HTMLInputElement.cpp

@@ -2480,16 +2480,6 @@ HTMLInputElement::GetPlaceholderVisibility()
   return state->GetPlaceholderVisibility();
 }
 
-NS_IMETHODIMP_(Element*)
-HTMLInputElement::GetPreviewNode()
-{
-  nsTextEditorState* state = GetEditorState();
-  if (state) {
-    return state->GetPreviewNode();
-  }
-  return nullptr;
-}
-
 NS_IMETHODIMP_(void)
 HTMLInputElement::SetPreviewValue(const nsAString& aValue)
 {

dom/html/HTMLInputElement.h

@@ -246,7 +246,6 @@ public:
   NS_IMETHOD BindToFrame(nsTextControlFrame* aFrame) override;
   NS_IMETHOD_(void) UnbindFromFrame(nsTextControlFrame* aFrame) override;
   NS_IMETHOD CreateEditor() override;
-  NS_IMETHOD_(Element*) GetPreviewNode() override;
   NS_IMETHOD_(void) UpdateOverlayTextVisibility(bool aNotify) override;
   NS_IMETHOD_(void) SetPreviewValue(const nsAString& aValue) override;
   NS_IMETHOD_(void) GetPreviewValue(nsAString& aValue) override;

dom/html/HTMLTextAreaElement.cpp

@@ -273,12 +273,6 @@ HTMLTextAreaElement::GetPlaceholderVisibility()
   return mState.GetPlaceholderVisibility();
 }
 
-NS_IMETHODIMP_(Element*)
-HTMLTextAreaElement::GetPreviewNode()
-{
-  return mState.GetPreviewNode();
-}
-
 NS_IMETHODIMP_(void)
 HTMLTextAreaElement::SetPreviewValue(const nsAString& aValue)
 {

dom/html/HTMLTextAreaElement.h

@@ -99,7 +99,6 @@ public:
   NS_IMETHOD BindToFrame(nsTextControlFrame* aFrame) override;
   NS_IMETHOD_(void) UnbindFromFrame(nsTextControlFrame* aFrame) override;
   NS_IMETHOD CreateEditor() override;
-  NS_IMETHOD_(Element*) GetPreviewNode() override;
   NS_IMETHOD_(void) UpdateOverlayTextVisibility(bool aNotify) override;
   NS_IMETHOD_(bool) GetPlaceholderVisibility() override;
   NS_IMETHOD_(bool) GetPreviewVisibility() override;

dom/html/nsITextControlElement.h

@@ -133,11 +133,6 @@ public:
    */
   NS_IMETHOD CreateEditor() = 0;
 
-  /**
-   * Get the preview anonymous node for the text control.
-   */
-  NS_IMETHOD_(mozilla::dom::Element*) GetPreviewNode() = 0;
-
   /**
    * Update preview value for the text control.
    */

layout/forms/nsTextControlFrame.cpp

@@ -1409,7 +1409,7 @@ nsTextControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
     // it if it has to be visible.
     if (!((kid->GetContent() == mPlaceholderDiv &&
            !txtCtrl->GetPlaceholderVisibility()) ||
-          (kid->GetContent() == txtCtrl->GetPreviewNode() &&
+          (kid->GetContent() == mPreviewDiv &&
            !txtCtrl->GetPreviewVisibility()))) {
       BuildDisplayListForChild(aBuilder, kid, set, 0);
     }