cc::SurfaceDependencyTracker should not crash when a Display goes away

cc/test/begin_frame_source_test.cc

 // Copyright 2015 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 "cc/test/begin_frame_source_test.h"
 
 #include "cc/test/begin_frame_args_test.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 
 void MockBeginFrameObserver::AsValueInto(
     base::trace_event::TracedValue* dict) const {
   dict->SetString("type", "MockBeginFrameObserver");
   dict->BeginDictionary("last_begin_frame_args");
   last_begin_frame_args.AsValueInto(dict);
   dict->EndDictionary();
 }
 
 MockBeginFrameObserver::MockBeginFrameObserver()
     : last_begin_frame_args(kDefaultBeginFrameArgs) {
-  EXPECT_CALL(*this, LastUsedBeginFrameArgs())
-      .Times(::testing::AnyNumber())
-      .WillRepeatedly(::testing::ReturnPointee(&last_begin_frame_args));
+  ON_CALL(*this, LastUsedBeginFrameArgs())
+      .WillByDefault(::testing::ReturnPointee(&last_begin_frame_args));
 }
 
 MockBeginFrameObserver::~MockBeginFrameObserver() {}
 
 const BeginFrameArgs MockBeginFrameObserver::kDefaultBeginFrameArgs =
     CreateBeginFrameArgsForTesting(
 #ifdef NDEBUG
         nullptr,
 #else
         FROM_HERE_WITH_EXPLICIT_FUNCTION(
             "MockBeginFrameObserver::kDefaultBeginFrameArgs"),
 #endif
         BeginFrameArgs::kManualSourceId,
         BeginFrameArgs::kStartingFrameNumber,
         -1,
         -1,
         -1);
 
 }  // namespace cc