[Mac] Address buggy permission bubble behaviour on dismissal via ESC.

chrome/browser/ui/cocoa/website_settings/permission_bubble_controller.mm

 // Copyright 2014 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/website_settings/permission_bubble_controller.h"
 
 #include <algorithm>
 
 #include "base/mac/bind_objc_block.h"
 #include "base/macros.h"
@@ skipping 207 matching lines @@
 + (NSInteger)getFullscreenLeftOffset;
 
 // Sets the width of both |viewA| and |viewB| to be the larger of the
 // two views' widths.  Does not change either view's origin or height.
 + (CGFloat)matchWidthsOf:(NSView*)viewA andOf:(NSView*)viewB;
 
 // Sets the offset of |viewA| so that its vertical center is aligned with the
 // vertical center of |viewB|.
 + (void)alignCenterOf:(NSView*)viewA verticallyToCenterOf:(NSView*)viewB;
 
+// BaseBubbleController override.
+- (IBAction)cancel:(id)sender;
+
 @end
 
 @implementation PermissionBubbleController
 
 - (id)initWithBrowser:(Browser*)browser bridge:(PermissionBubbleCocoa*)bridge {
   DCHECK(browser);
   DCHECK(bridge);
   browser_ = browser;
   base::scoped_nsobject<PermissionBubbleWindow> window(
       [[PermissionBubbleWindow alloc]
@@ skipping 415 matching lines @@
 }
 
 + (void)alignCenterOf:(NSView*)viewA verticallyToCenterOf:(NSView*)viewB {
   NSRect frameA = [viewA frame];
   NSRect frameB = [viewB frame];
   frameA.origin.y =
       NSMinY(frameB) + std::floor((NSHeight(frameB) - NSHeight(frameA)) / 2);
   [viewA setFrameOrigin:frameA.origin];
 }
 
+- (IBAction)cancel:(id)sender {
+  // This is triggered by ESC when the bubble has focus.
+  DCHECK(delegate_);
+  delegate_->Closing();
+  [super cancel:sender];
+}
+
 @end  // implementation PermissionBubbleController