media: Switch from testing::CreateFunctor to lambda.

This change switches from using testing::CreateFunctor
when calling testing::Invoke() to a C++ lambda. This
improves test readibility and makes easier an upcoming
changes to gmock_mutant.h (switch away from base::Bind()).

Bug: 1007833, 806952
Change-Id: I1473a6041e0aedbc0b6f8eb212ebb918742bc7c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872815Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#708387}

media/renderers/video_renderer_impl_unittest.cc

@@ -35,7 +35,6 @@
 #include "media/base/wall_clock_time_source.h"
 #include "media/renderers/video_renderer_impl.h"
 #include "media/video/mock_gpu_memory_buffer_video_frame_pool.h"
-#include "testing/gmock_mutant.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::base::test::RunCallback;
@@ -44,7 +43,6 @@ using ::base::test::RunOnceCallback;
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::Combine;
-using ::testing::CreateFunctor;
 using ::testing::DoAll;
 using ::testing::Invoke;
 using ::testing::Mock;
@@ -224,7 +222,9 @@ class VideoRendererImplTest : public testing::Test {
 
     WaitableMessageLoopEvent event;
     PipelineStatusCB error_cb = event.GetPipelineStatusCB();
-    EXPECT_CALL(mock_cb_, OnError(_)).WillOnce(Invoke(CreateFunctor(error_cb)));
+    EXPECT_CALL(mock_cb_, OnError(_))
+        .WillOnce(Invoke(
+            [error_cb](PipelineStatus status) { error_cb.Run(status); }));
     event.RunAndWaitForStatus(expected);
   }