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

content/browser/renderer_host/render_widget_host_view_base.cc

Index: content/browser/renderer_host/render_widget_host_view_base.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_base.cc b/content/browser/renderer_host/render_widget_host_view_base.cc
index c4b9d14c8d71540e0479b99ab99c7b6b64482688..861cda335cade09399eec5c2a52f5b8cfe8593e4 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.cc
+++ b/content/browser/renderer_host/render_widget_host_view_base.cc
@@ -411,6 +411,11 @@ void RenderWidgetHostViewBase::TextInputStateChanged(
 #endif
 }
 
+void RenderWidgetHostViewBase::ImeCancelComposition() {
+  if (GetTextInputManager())
+    GetTextInputManager()->ImeCancelComposition(this);

[kenrb, 2016/06/28 15:12:41]

I notice the method above this one has a USE_AURA guard, but that's not
necessary, right? GetTextInputManager() should return nullptr on non-Aura
platforms until it is implemented on them.

[EhsanK, 2016/06/28 16:41:19]

We always create TextInputManager now which is on all platforms. Therefore this
will never be null.

But that being said, there is no reason to have this code path in other
platforms now since TextInputManager has no observers (tab's view) in other
platforms.

I will enclose it in #ifdefs.

+}
+
 TextInputManager* RenderWidgetHostViewBase::GetTextInputManager() {
   if (text_input_manager_)
     return text_input_manager_;