cc: Make BackToBackBeginFrameSource a SyntheticBeginFrameSource.

cc/test/scheduler_test_common.cc

Index: cc/test/scheduler_test_common.cc
diff --git a/cc/test/scheduler_test_common.cc b/cc/test/scheduler_test_common.cc
index 36201961c82b57c9e8df5549ce78bb094636fd62..96f1197e52f0703ea1b815b5356747d653fbee40 100644
--- a/cc/test/scheduler_test_common.cc
+++ b/cc/test/scheduler_test_common.cc
@@ -22,10 +22,8 @@ base::TimeTicks FakeDelayBasedTimeSource::Now() const { return now_; }
 
 TestDelayBasedTimeSource::TestDelayBasedTimeSource(
     base::SimpleTestTickClock* now_src,
-    base::TimeDelta interval,
     OrderedSimpleTaskRunner* task_runner)
-    : DelayBasedTimeSource(interval, task_runner), now_src_(now_src) {
-}
+    : DelayBasedTimeSource(task_runner), now_src_(now_src) {}
 
 base::TimeTicks TestDelayBasedTimeSource::Now() const {
   return now_src_->NowTicks();
@@ -42,31 +40,6 @@ FakeBeginFrameSource::FakeBeginFrameSource() {}
 
 FakeBeginFrameSource::~FakeBeginFrameSource() {}
 
-TestBackToBackBeginFrameSource::TestBackToBackBeginFrameSource(
-    base::SimpleTestTickClock* now_src,
-    base::SingleThreadTaskRunner* task_runner)
-    : BackToBackBeginFrameSource(task_runner), now_src_(now_src) {
-}
-
-TestBackToBackBeginFrameSource::~TestBackToBackBeginFrameSource() {
-}
-
-base::TimeTicks TestBackToBackBeginFrameSource::Now() {
-  return now_src_->NowTicks();
-}
-
-TestSyntheticBeginFrameSource::TestSyntheticBeginFrameSource(
-    base::SimpleTestTickClock* now_src,
-    OrderedSimpleTaskRunner* task_runner,
-    base::TimeDelta initial_interval)
-    : SyntheticBeginFrameSource(
-          TestDelayBasedTimeSource::Create(now_src,
-                                           initial_interval,
-                                           task_runner)) {}
-
-TestSyntheticBeginFrameSource::~TestSyntheticBeginFrameSource() {
-}
-
 std::unique_ptr<FakeCompositorTimingHistory>
 FakeCompositorTimingHistory::Create(
     bool using_synchronous_renderer_compositor) {