chrome/browser should build on the x86_64 architecture

chrome/browser/ui/cocoa/history_overlay_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/history_overlay_controller.h"
 
 #include "base/logging.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ skipping 94 matching lines @@
 
 - (void)setProgress:(CGFloat)gestureAmount {
   NSRect parentFrame = [parent_ frame];
   // Scale the gesture amount so that the progress is indicative of the gesture
   // being completed.
   gestureAmount = std::abs(gestureAmount) / kGestureCompleteProgress;
 
   // When tracking the gesture, the height is constant and the alpha value
   // changes from [0.25, 0.65].
   CGFloat height = kShieldHeight;
-  CGFloat shieldAlpha = std::min(0.65f, std::max(gestureAmount, 0.25f));
+  CGFloat shieldAlpha = std::min(static_cast<CGFloat>(0.65f),

[Mark Mentovai, 2012/08/20 13:25:58]

Again.

+                                 std::max(gestureAmount,
+                                          static_cast<CGFloat>(0.25f)));
 
   // When the gesture is very likely to be completed (90% in this case), grow
   // the semicircle's height and lock the alpha to 0.75.
   if (gestureAmount > 0.9) {
     height += kShieldHeightCompletionAdjust;
     shieldAlpha = 0.75;
   }
 
   // Compute the new position based on the progress.
   NSRect frame = self.view.frame;
@@ skipping 33 matching lines @@
   [dictionary setObject:animation forKey:@"alphaValue"];
   [overlay setAnimations:dictionary];
   [[overlay animator] setAlphaValue:0.0];
 }
 
 - (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)finished {
   [self.view removeFromSuperview];
 }
 
 @end