Refactor: Untangle Mac's ExclusiveAccessContext from BrowserWindow

chrome/browser/ui/cocoa/exclusive_access_bubble_window_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 <Cocoa/Cocoa.h>
 
 #include "base/logging.h"  // for NOTREACHED()
 #include "base/mac/bundle_locations.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 123 matching lines @@
 
   [info_bubble orderFront:self];
 }
 
 - (void)awakeFromNib {
   DCHECK([[self window] isKindOfClass:[InfoBubbleWindow class]]);
   [messageLabel_ setStringValue:[self getLabelText]];
   [self initializeLabelAndButton];
 }
 
-- (void)positionInWindowAtTop:(CGFloat)maxY width:(CGFloat)maxWidth {
+- (void)positionInWindowAtTop:(CGFloat)maxY {
   NSRect windowFrame = [self window].frame;
   NSRect ownerWindowFrame = [owner_ window].frame;
   NSPoint origin;
   origin.x = ownerWindowFrame.origin.x +
              (int)(NSWidth(ownerWindowFrame) / 2 - NSWidth(windowFrame) / 2);
   origin.y = ownerWindowFrame.origin.y + maxY - NSHeight(windowFrame);
   [[self window] setFrameOrigin:origin];
 }
 
 // Called when someone clicks on the embedded link.
@@ skipping 188 matching lines @@
 - (void)hideSoon {
   hideTimer_.reset(
       [[NSTimer scheduledTimerWithTimeInterval:kInitialDelay
                                         target:self
                                       selector:@selector(hideTimerFired:)
                                       userInfo:nil
                                        repeats:NO] retain]);
 }
 
 @end