Fix a test-only leak in MockScreenOrientationClient.

content/shell/renderer/test_runner/mock_screen_orientation_client.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 "content/shell/renderer/test_runner/mock_screen_orientation_client.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
@@ skipping 114 matching lines @@
 }
 
 void MockScreenOrientationClient::UpdateLockSync(
     blink::WebScreenOrientationLockType lock,
     blink::WebLockOrientationCallback* callback) {
   DCHECK(lock != blink::WebScreenOrientationLockDefault);
   current_lock_ = lock;
   if (!IsOrientationAllowedByCurrentLock(current_orientation_))
     UpdateScreenOrientation(SuitableOrientationForCurrentLock());
   callback->onSuccess();
+  delete callback;
 }
 
 void MockScreenOrientationClient::ResetLockSync() {
   bool will_screen_orientation_need_updating =
       !IsOrientationAllowedByCurrentLock(device_orientation_);
   current_lock_ = blink::WebScreenOrientationLockDefault;
   if (will_screen_orientation_need_updating)
     UpdateScreenOrientation(device_orientation_);
 }
 
 blink::WebScreenOrientationType
 MockScreenOrientationClient::SuitableOrientationForCurrentLock() {
   switch (current_lock_) {
     case blink::WebScreenOrientationLockPortraitSecondary:
       return blink::WebScreenOrientationPortraitSecondary;
     case blink::WebScreenOrientationLockLandscapePrimary:
     case blink::WebScreenOrientationLockLandscape:
       return blink::WebScreenOrientationLandscapePrimary;
     case blink::WebScreenOrientationLockLandscapeSecondary:
       return blink::WebScreenOrientationLandscapePrimary;
     default:
       return blink::WebScreenOrientationPortraitPrimary;
   }
 }
 
 }  // namespace content