Reverting r12383, caused a build breakage on all platforms.

chrome/views/controls/button/custom_button.cc

 // Copyright (c) 2006-2008 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 "chrome/views/controls/button/custom_button.h"
 
 #include "base/keyboard_codes.h"
 #include "chrome/common/drag_drop_types.h"
 #include "chrome/common/gfx/chrome_canvas.h"
 #include "chrome/common/throb_animation.h"
@@ skipping 64 matching lines @@
 bool CustomButton::IsFocusable() const {
   return (state_ != BS_DISABLED) && View::IsFocusable();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CustomButton, protected:
 
 CustomButton::CustomButton(ButtonListener* listener)
     : Button(listener),
       state_(BS_NORMAL),
-      animate_on_state_change_(true),
-      triggerable_event_flags_(MouseEvent::EF_LEFT_BUTTON_DOWN) {
+      animate_on_state_change_(true) {
   hover_animation_.reset(new ThrobAnimation(this));
   hover_animation_->SetSlideDuration(kHoverFadeDurationMs);
 }
 
 bool CustomButton::IsTriggerableEvent(const MouseEvent& e) {
-  return (triggerable_event_flags_ & e.GetFlags()) != 0;
+  return e.IsLeftMouseButton();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CustomButton, View overrides (protected):
 
 bool CustomButton::AcceleratorPressed(const Accelerator& accelerator) {
   if (enabled_) {
     SetState(BS_NORMAL);
     NotifyClick(0);
     return true;
@@ skipping 133 matching lines @@
 
 bool CustomButton::IsHighlighted() const {
   return state_ == BS_HOT;
 }
 
 bool CustomButton::IsPushed() const {
   return state_ == BS_PUSHED;
 }
 
 }  // namespace views