Rename ScopedTaskEnvironment::ExecutionMode

ScopedTaskEnvironment::ExecutionMode is becoming
ScopedTaskEnvironment::ThreadPoolExecutionMode

This CL was uploaded by git cl split.

R=emircan@chromium.org

Bug: 708584
Change-Id: I623b6a7ae0d359ea409285a045b7d2d0136af6db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583803
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654524}

content/renderer/media/audio/audio_renderer_sink_cache_unittest.cc

@@ -33,8 +33,9 @@ constexpr base::TimeDelta kDeleteTimeout =
 class AudioRendererSinkCacheTest : public testing::Test {
  public:
   AudioRendererSinkCacheTest()
-      : task_env_(base::test::ScopedTaskEnvironment::MainThreadType::MOCK_TIME,
-                  base::test::ScopedTaskEnvironment::ExecutionMode::QUEUED),
+      : task_env_(
+            base::test::ScopedTaskEnvironment::MainThreadType::MOCK_TIME,
+            base::test::ScopedTaskEnvironment::ThreadPoolExecutionMode::QUEUED),
         cache_(std::make_unique<AudioRendererSinkCacheImpl>(
             task_env_.GetMainThreadTaskRunner(),
             base::BindRepeating(&AudioRendererSinkCacheTest::CreateSink,