ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

ui/views/controls/tabbed_pane/tabbed_pane.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "ui/views/controls/tabbed_pane/tabbed_pane.h"
 
 #include "base/logging.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/controls/tabbed_pane/native_tabbed_pane_wrapper.h"
@@ skipping 110 matching lines @@
     if (selected_tab) {
       selected_tab->GetWidget()->NotifyAccessibilityEvent(
           selected_tab, ui::AccessibilityTypes::EVENT_FOCUS, true);
     }
   } else {
     View::OnFocus();  // Will focus the RootView window (so we still get
                       // keyboard messages).
   }
 }
 
-void TabbedPane::OnPaintFocusBorder(gfx::Canvas* canvas) {
+void TabbedPane::OnPaintFocusBorder(gfx::CanvasSkia* canvas) {
   if (NativeViewHost::kRenderNativeControlFocus)
     View::OnPaintFocusBorder(canvas);
 }
 
 void TabbedPane::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_PAGETABLIST;
   state->name = accessible_name_;
 }
 
 }  // namespace views