Eliminate faux-RTTI code from BrowserView.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index 6eea993064381734d19a2b21ebaa8b595b931907..73cccd53caee69362e41da731ea84207ccd45fc4 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -809,6 +809,14 @@ void Textfield::OnGestureEvent(ui::GestureEvent* event) {
   }
 }
 
+// This function is called by BrowserView to execute clipboard commands.
+bool Textfield::AcceleratorPressed(const ui::Accelerator& accelerator) {
+  ui::KeyEvent event(accelerator.type(), accelerator.key_code(),
+                     accelerator.modifiers());
+  ExecuteCommand(GetCommandForKeyEvent(event, HasSelection()));
+  return true;
+}
+
 void Textfield::AboutToRequestFocusFromTabTraversal(bool reverse) {
   SelectAll(false);
 }