Mac: Disable r470769. I.e., Don't pump chrome tasks in private message loop modes.

base/message_loop/message_pump_mac.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 "base/message_loop/message_pump_mac.h"
 
 #import <Foundation/Foundation.h>
 
 #include <limits>
 
@@ skipping 29 matching lines @@
     // Process work when NSMenus are fading out.
     CFSTR("com.apple.hitoolbox.windows.windowfadingmode"),
 
     // Process work when AppKit is highlighting an item on the main menubar.
     CFSTR("NSUnhighlightMenuRunLoopMode"),
 };
 
 // Mask that determines which modes in |kAllModes| to use.
 enum { kCommonModeMask = 0x1, kAllModesMask = ~0 };
 
+// Modes to use for MessagePumpNSApplication. Currently just common and
+// exclusive modes. TODO(tapted): Use kAllModesMask once http://crbug.com/640466
+// blockers are fixed.
+enum { kNSApplicationModeMask = 0x3 };
+
 void NoOp(void* info) {
 }
 
 const CFTimeInterval kCFTimeIntervalMax =
     std::numeric_limits<CFTimeInterval>::max();
 
 #if !defined(OS_IOS)
 // Set to true if MessagePumpMac::Create() is called before NSApp is
 // initialized.  Only accessed from the main thread.
 bool g_not_using_cr_app = false;
@@ skipping 655 matching lines @@
 void MessagePumpUIApplication::Attach(Delegate* delegate) {
   DCHECK(!run_loop_);
   run_loop_ = new RunLoop();
   CHECK(run_loop_->BeforeRun());
   SetDelegate(delegate);
 }
 
 #else
 
 MessagePumpNSApplication::MessagePumpNSApplication()
-    : MessagePumpCFRunLoopBase(kAllModesMask),
+    : MessagePumpCFRunLoopBase(kNSApplicationModeMask),
       keep_running_(true),
       running_own_loop_(false) {}
 
 MessagePumpNSApplication::~MessagePumpNSApplication() {}
 
 void MessagePumpNSApplication::DoRun(Delegate* delegate) {
   bool last_running_own_loop_ = running_own_loop_;
 
   // NSApp must be initialized by calling:
   // [{some class which implements CrAppProtocol} sharedApplication]
@@ skipping 127 matching lines @@
     [NSApplication sharedApplication];
     g_not_using_cr_app = true;
     return new MessagePumpNSApplication;
 #endif
   }
 
   return new MessagePumpNSRunLoop;
 }
 
 }  // namespace base