[Mac] Activate notifications on mouse *up*.

ui/message_center/cocoa/notification_controller.mm

 // Copyright (c) 2013 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 "ui/message_center/cocoa/notification_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 166 matching lines @@
 @end
 
 @implementation MCNotificationView
 - (id)initWithController:(MCNotificationController*)controller
                    frame:(NSRect)frame {
   if ((self = [super initWithFrame:frame]))
     controller_ = controller;
   return self;
 }
 
-- (void)mouseDown:(NSEvent*)event {
-  if ([event type] != NSLeftMouseDown) {
-    [super mouseDown:event];
+- (void)mouseUp:(NSEvent*)event {
+  if (event.type != NSLeftMouseUp) {
+    [super mouseUp:event];
     return;
   }
-  [controller_ notificationClicked];
+  if (NSPointInRect([self convertPoint:event.locationInWindow fromView:nil],
+                    self.bounds)) {
+    [controller_ notificationClicked];
+  }
 }
 
 - (NSView*)hitTest:(NSPoint)point {
   // Route the mouse click events on NSTextView to the container view.
   NSView* hitView = [super hitTest:point];
   if (hitView)
     return [hitView isKindOfClass:[NSTextView class]] ? self : hitView;
   return nil;
 }
 
@@ skipping 777 matching lines @@
                    forFont:(NSFont*)nsfont
           maxNumberOfLines:(size_t)lines {
   size_t unused;
   return [self wrapText:text
                 forFont:nsfont
        maxNumberOfLines:lines
             actualLines:&unused];
 }
 
 @end