Remove OnUndoScrollFocusedEditableNodeIntoRect()

This method is declared and never implemented. It was to be removed in:
https://codereview.chromium.org/197873002.

TBR=alexmos@chromium.org

Bug: None
Change-Id: I887a300e1689c28e74699749be5769a38c3ef4bf
Reviewed-on: https://chromium-review.googlesource.com/890029Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533211}

content/renderer/render_view_impl.h

@@ -544,7 +544,6 @@ class CONTENT_EXPORT RenderViewImpl : public RenderWidget,
   void OnSelectWordAroundCaret();
   void OnAudioStateChanged(bool is_audio_playing);
 #if defined(OS_ANDROID)
-  void OnUndoScrollFocusedEditableNodeIntoRect();
   void OnUpdateBrowserControlsState(bool enable_hiding,
                                     bool enable_showing,
                                     bool animate);