Fix Windows compile error with cherry-pick.

content/renderer/input/render_widget_input_handler_delegate.h

Index: content/renderer/input/render_widget_input_handler_delegate.h
diff --git a/content/renderer/input/render_widget_input_handler_delegate.h b/content/renderer/input/render_widget_input_handler_delegate.h
index f23ff3a1770cfd57a6aa39d5504f6bcd207a660f..714bd5feec60459b0729c115e47e9022f2d91eec 100644
--- a/content/renderer/input/render_widget_input_handler_delegate.h
+++ b/content/renderer/input/render_widget_input_handler_delegate.h
@@ -73,7 +73,7 @@ class CONTENT_EXPORT RenderWidgetInputHandlerDelegate {
   virtual void UpdateTextInputState() = 0;
 
   // Clear the text input state.
-  virtual void ClearTextInputState() = 0;
+  virtual void ClearTextInputState() {}
 
   // Notifies that a gesture event is about to be handled.
   // Returns true if no further handling is needed. In that case, the event