Remove SendBeginFramesToChildren plumbing

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index f10f157cfe5397fc204a0fb921501830655ac3ee..a448237175eaccedb436b473ed8e27467be7717f 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -4812,77 +4812,6 @@ class LayerTreeHostTestBeginMainFrameTimeIsAlsoImplTime
 //    LayerTreeHostTestBeginMainFrameTimeIsAlsoImplTime);
 SINGLE_THREAD_TEST_F(LayerTreeHostTestBeginMainFrameTimeIsAlsoImplTime);
 
-class LayerTreeHostTestSendBeginFramesToChildren : public LayerTreeHostTest {
- public:
-  LayerTreeHostTestSendBeginFramesToChildren()
-      : begin_frame_sent_to_children_(false) {
-  }
-
-  void BeginTest() override {
-    // Kick off the test with a commit.
-    PostSetNeedsCommitToMainThread();
-  }
-
-  void SendBeginFramesToChildren(const BeginFrameArgs& args) override {
-    begin_frame_sent_to_children_ = true;
-    EndTest();
-  }
-
-  void DidBeginMainFrame() override {
-    // Children requested BeginFrames.
-    layer_tree_host()->SetChildrenNeedBeginFrames(true);
-  }
-
-  void AfterTest() override {
-    // Ensure that BeginFrame message is sent to children during parent
-    // scheduler handles its BeginFrame.
-    EXPECT_TRUE(begin_frame_sent_to_children_);
-  }
-
- private:
-  bool begin_frame_sent_to_children_;
-};
-
-SINGLE_THREAD_TEST_F(LayerTreeHostTestSendBeginFramesToChildren);
-
-class LayerTreeHostTestSendBeginFramesToChildrenWithExternalBFS
-    : public LayerTreeHostTest {
- public:
-  LayerTreeHostTestSendBeginFramesToChildrenWithExternalBFS()
-      : begin_frame_sent_to_children_(false) {
-  }
-
-  void InitializeSettings(LayerTreeSettings* settings) override {
-    settings->use_external_begin_frame_source = true;
-  }
-
-  void BeginTest() override {
-    // Kick off the test with a commit.
-    PostSetNeedsCommitToMainThread();
-  }
-
-  void SendBeginFramesToChildren(const BeginFrameArgs& args) override {
-    begin_frame_sent_to_children_ = true;
-    EndTest();
-  }
-
-  void DidBeginMainFrame() override {
-    // Children requested BeginFrames.
-    layer_tree_host()->SetChildrenNeedBeginFrames(true);
-  }
-
-  void AfterTest() override {
-    // Ensure that BeginFrame message is sent to children during parent
-    // scheduler handles its BeginFrame.
-    EXPECT_TRUE(begin_frame_sent_to_children_);
-  }
-
- private:
-  bool begin_frame_sent_to_children_;
-};
-
-SINGLE_THREAD_TEST_F(LayerTreeHostTestSendBeginFramesToChildrenWithExternalBFS);
-
 class LayerTreeHostTestActivateOnInvisible : public LayerTreeHostTest {
  public:
   LayerTreeHostTestActivateOnInvisible()