Revert of Takeover MT initiated animations from the compositor

third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.cpp

Index: third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.cpp b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.cpp
index 27dfece11f6ad9c1e092ba88961e180ddb50ae6b..798d468459513d8b21a29ba751733479481c3bfe 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.cpp
@@ -65,7 +65,6 @@
     case RunState::WaitingToSendToCompositor:
     case RunState::RunningOnMainThread:
     case RunState::RunningOnCompositorButNeedsUpdate:
-    case RunState::RunningOnCompositorButNeedsTakeover:
     case RunState::WaitingToCancelOnCompositor:
         return true;
     }
@@ -116,7 +115,6 @@
     case RunState::WaitingToCancelOnCompositor:
     case RunState::PostAnimationCleanup:
         break;
-    case RunState::RunningOnCompositorButNeedsTakeover:
     case RunState::WaitingToSendToCompositor:
         if (m_compositorAnimationId) {
             // We still have a previous animation running on the compositor.
@@ -137,30 +135,6 @@
     }
 }
 
-void ScrollAnimatorCompositorCoordinator::takeoverCompositorAnimation()
-{
-    switch (m_runState) {
-    case RunState::Idle:
-    case RunState::WaitingToCancelOnCompositor:
-    case RunState::PostAnimationCleanup:
-    case RunState::RunningOnCompositorButNeedsTakeover:
-    case RunState::WaitingToSendToCompositor:
-    case RunState::RunningOnMainThread:
-        break;
-    case RunState::RunningOnCompositorButNeedsUpdate:
-    case RunState::RunningOnCompositor:
-        // We call abortAnimation that makes changes to the animation running on
-        // the compositor. Thus, this function should only be called when in
-        // CompositingClean state.
-        abortAnimation();
-
-        m_runState = RunState::RunningOnCompositorButNeedsTakeover;
-
-        // Get serviced the next time compositor updates are allowed.
-        scrollableArea()->registerForAnimation();
-    }
-}
-
 void ScrollAnimatorCompositorCoordinator::compositorAnimationFinished(
     int groupId)
 {
@@ -180,7 +154,6 @@
         break;
     case RunState::RunningOnCompositor:
     case RunState::RunningOnCompositorButNeedsUpdate:
-    case RunState::RunningOnCompositorButNeedsTakeover:
     case RunState::WaitingToCancelOnCompositor:
         m_runState = RunState::PostAnimationCleanup;
         // Get serviced the next time compositor updates are allowed.