Fix some gcc 4.4 issues when compiling with toolkit_views.

views/controls/button/custom_button.cc

 // Copyright (c) 2009 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 "views/controls/button/custom_button.h"
 
 #include "app/throb_animation.h"
 #include "base/keyboard_codes.h"
 
 namespace views {
@@ skipping 78 matching lines @@
 bool CustomButton::AcceleratorPressed(const Accelerator& accelerator) {
   if (enabled_) {
     SetState(BS_NORMAL);
 #if defined(OS_WIN)
     KeyEvent key_event(Event::ET_KEY_RELEASED, accelerator.GetKeyCode(), 0, 0);
 #elif defined(OS_LINUX)
     GdkEventKey gdk_key;
     memset(&gdk_key, 0, sizeof(GdkEventKey));
     gdk_key.type = GDK_KEY_RELEASE;
     gdk_key.keyval = accelerator.GetKeyCode();
-    gdk_key.state = accelerator.IsAltDown() << 3 +
-                    accelerator.IsCtrlDown() << 2 +
+    gdk_key.state = (accelerator.IsAltDown() << 3) +
+                    (accelerator.IsCtrlDown() << 2) +
                     accelerator.IsShiftDown();
     KeyEvent key_event(&gdk_key, false);
 #endif
     NotifyClick(key_event);
     return true;
   }
   return false;
 }
 
 bool CustomButton::OnMousePressed(const MouseEvent& e) {
@@ skipping 132 matching lines @@
 
 bool CustomButton::IsHighlighted() const {
   return state_ == BS_HOT;
 }
 
 bool CustomButton::IsPushed() const {
   return state_ == BS_PUSHED;
 }
 
 }  // namespace views