Revert 207409 "[Mac][MC] Re-add the global event monitor to clos..."

> [Mac][MC] Re-add the global event monitor to close the bubble.
> 
> This is needed because clicking on other NSStatusItems and menubar extras does
> not generate a -windowDidResignKey: notification.
> 
> BUG=243128
> TEST=See comment 8 in the bug for steps.
> R=dewittj@chromium.org, sail@chromium.org
> 
> Review URL: https://codereview.chromium.org/17469002

TBR=rsesek@chromium.org

Review URL: https://codereview.chromium.org/17218008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207417 0039d316-1c4b-4281-b951-d872f2087c98

ui/message_center/cocoa/tray_controller.h

@@ -26,10 +26,6 @@ MESSAGE_CENTER_EXPORT
 
   // View controller that provides this window's content.
   scoped_nsobject<MCTrayViewController> viewController_;
-
-  // An event monitor that listens for clicks outside the tray window to cause
-  // it to close.
-  id clickEventMonitor_;
 }
 
 // Designated initializer.

ui/message_center/cocoa/tray_controller.mm

@@ -48,26 +48,10 @@ - (id)initWithMessageCenterTray:(message_center::MessageCenterTray*)tray {
     NSView* contentView = [viewController_ view];
     [window setFrame:[contentView frame] display:NO];
     [window setContentView:contentView];
-
-    // The global event monitor will close the tray in response to events
-    // delivered to other applications, and -windowDidResignKey: will catch
-    // events within the application.
-    clickEventMonitor_ =
-        [NSEvent addGlobalMonitorForEventsMatchingMask:NSLeftMouseDownMask |
-                                                       NSRightMouseDownMask |
-                                                       NSOtherMouseDownMask
-            handler:^(NSEvent* event) {
-                [self windowDidResignKey:nil];
-            }];
   }
   return self;
 }
 
-- (void)dealloc {
-  [NSEvent removeMonitor:clickEventMonitor_];
-  [super dealloc];
-}
-
 - (void)close {
   [viewController_ onWindowClosing];
   [super close];