Fix Harmony popover buttons being flush with their content.

ui/views/window/dialog_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 #define UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
@@ skipping 87 matching lines @@
   bool ShouldDefaultButtonBeBlue() const override;
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   bool IsDialogButtonEnabled(ui::DialogButton button) const override;
 
   // Overridden from WidgetDelegate:
   View* GetInitiallyFocusedView() override;
   DialogDelegate* AsDialogDelegate() override;
   ClientView* CreateClientView(Widget* widget) override;
   NonClientFrameView* CreateNonClientFrameView(Widget* widget) override;
 
-  // Create a frame view using the new dialog style.
-  // |content_margins|: margins between the content and the inside of the
-  // border, in pixels.
-  static NonClientFrameView* CreateDialogFrameView(
-      Widget* widget,
-      const gfx::Insets& content_margins);
+  static NonClientFrameView* CreateDialogFrameView(Widget* widget);
 
   // Returns true if this particular dialog should use a Chrome-styled frame
   // like the one used for bubbles. The alternative is a more platform-native
   // frame.
   virtual bool ShouldUseCustomFrame() const;
 
   // A helper for accessing the DialogClientView object contained by this
   // delegate's Window.
   const DialogClientView* GetDialogClientView() const;
   DialogClientView* GetDialogClientView();
@@ skipping 29 matching lines @@
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_