Revert of Re-enabling 720p webcam test for QTKit on Mac.

chrome/browser/media/chrome_webrtc_webcam_browsertest.cc

 // 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.
 
 #include "base/command_line.h"
 #include "chrome/browser/media/webrtc_browsertest_base.h"
 #include "chrome/browser/media/webrtc_browsertest_common.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 79 matching lines @@
     // "Temporarily" disabled on QtKit due to http://crbug.com/375185.
     EXPECT_EQ("320x240",
               GetUserMediaAndGetStreamSize(tab,
                                            kVideoCallConstraintsQVGA));
   }
 
   EXPECT_EQ("640x480",
             GetUserMediaAndGetStreamSize(tab, kVideoCallConstraintsVGA));
   EXPECT_EQ("640x360",
             GetUserMediaAndGetStreamSize(tab, kVideoCallConstraints360p));
-  EXPECT_EQ("1280x720",
-            GetUserMediaAndGetStreamSize(tab, kVideoCallConstraints720p));
 
-  // QTKit only supports up to 720p.
+  // QTKit supports up to 480p (used to support 720p until crbug.com/440762).
   if (IsOnQtKit())
     return;
 
+  EXPECT_EQ("1280x720",
+            GetUserMediaAndGetStreamSize(tab, kVideoCallConstraints720p));
   EXPECT_EQ("1920x1080",
             GetUserMediaAndGetStreamSize(tab, kVideoCallConstraints1080p));
 }
 
 INSTANTIATE_TEST_CASE_P(WebRtcWebcamBrowserTests,
                         WebRtcWebcamBrowserTest,
                         testing::ValuesIn(kTestConfigFlags));