[Mac] ScopedSendingEvent finds NSApp by itself.

base/chrome_application_mac.mm

 // Copyright (c) 2009 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_application_mac.h"
 
 #include "base/logging.h"
 
 @interface CrApplication ()
 @property(readwrite,
@@ skipping 11 matching lines @@
   NSApplication* app = [super sharedApplication];
   if (![NSApp isKindOfClass:self]) {
     LOG(ERROR) << "NSApp should be of type " << [[self className] UTF8String]
                << ", not " << [[NSApp className] UTF8String];
     DCHECK(false) << "NSApp is of wrong type";
   }
   return app;
 }
 
 - (void)sendEvent:(NSEvent*)event {
-  chrome_application_mac::ScopedSendingEvent sendingEventScoper(self);
+  chrome_application_mac::ScopedSendingEvent sendingEventScoper;
   [super sendEvent:event];
 }
 
 @end
 
 namespace chrome_application_mac {
 
-ScopedSendingEvent::ScopedSendingEvent(CrApplication* app) : app_(app) {
-  handling_ = [app_ isHandlingSendEvent];
+ScopedSendingEvent::ScopedSendingEvent()
+    : app_(static_cast<CrApplication*>([CrApplication sharedApplication])),
+      handling_([app_ isHandlingSendEvent]) {
   [app_ setHandlingSendEvent:YES];
 }
 
 ScopedSendingEvent::~ScopedSendingEvent() {
   [app_ setHandlingSendEvent:handling_];
 }
 
 }  // namespace chrome_application_mac