Add ExtendSelectionAndDelete() method to ui::TextInputClient.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index f4ed16aa32154ed941c1d8b470f27c05a85e2504..9be092672337a461509892ad6c98ff572a34f97c 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -295,6 +295,11 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
   // Cancels an ongoing composition.
   void ImeCancelComposition();
 
+  // Deletes the current selection plus the specified number of characters
+  // before and after the selection or caret.
+  // |before| and |after| can't be negative.
+  void ExtendSelectionAndDelete(int before, int after);
+
   // This is for derived classes to give us access to the resizer rect.
   // And to also expose it to the RenderWidgetHostView.
   virtual gfx::Rect GetRootWindowResizerRect() const;