Updated DropdownBarHost to use Layer clipping instead of OnPaint() clipping.

chrome/browser/ui/views/dropdown_bar_host_delegate.h

Index: chrome/browser/ui/views/dropdown_bar_host_delegate.h
diff --git a/chrome/browser/ui/views/dropdown_bar_host_delegate.h b/chrome/browser/ui/views/dropdown_bar_host_delegate.h
index 9b98b4b4d25f83d56355c23f2ab485183ec497d9..c530414581421932b648106533738fbd4508b084 100644
--- a/chrome/browser/ui/views/dropdown_bar_host_delegate.h
+++ b/chrome/browser/ui/views/dropdown_bar_host_delegate.h
@@ -10,10 +10,6 @@ class DropdownBarHostDelegate {
   // Claims focus for the text field and selects its contents.
   virtual void SetFocusAndSelection(bool select_all) = 0;
 
-  // Updates the view to let it know where the host is clipping the
-  // dropdown widget (while animating the opening or closing of the widget).
-  virtual void SetAnimationOffset(int offset) = 0;
-
  protected:
   virtual ~DropdownBarHostDelegate() {}
 };