Implement RenderWidgetHostViewBase::ImeCancelComposition for all Views (Aura Only)

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 83f8b72e9e5f6da780e6f80d54117f53f394f718..f32a160fd36634978a9a359fab36757b551132f1 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -977,12 +977,6 @@ void RenderWidgetHostViewAura::SetIsLoading(bool is_loading) {
   UpdateCursorIfOverSelf();
 }
 
-void RenderWidgetHostViewAura::ImeCancelComposition() {
-  if (GetInputMethod())
-    GetInputMethod()->CancelComposition(this);
-  has_composition_text_ = false;
-}
-
 void RenderWidgetHostViewAura::ImeCompositionRangeChanged(
     const gfx::Range& range,
     const std::vector<gfx::Rect>& character_bounds) {
@@ -3030,6 +3024,18 @@ void RenderWidgetHostViewAura::OnUpdateTextInputStateCalled(
     GetInputMethod()->ShowImeIfNeeded();
 }
 
+void RenderWidgetHostViewAura::OnImeCancelComposition(
+    TextInputManager* text_input_manager,
+    RenderWidgetHostViewBase* view) {
+  // |view| is not necessarily the one corresponding to
+  // TextInputManager::GetActiveWidget() as RenderWidgetHostViewAura can call
+  // this method to finish any ongoing composition in response to a mouse down
+  // event.
+  if (GetInputMethod())
+    GetInputMethod()->CancelComposition(this);
+  has_composition_text_ = false;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public: