Revert of TransformTree::SetRootTransformsAndScales should set 'needs_update' on transform tree only

cc/trees/property_tree_unittest.cc

Index: cc/trees/property_tree_unittest.cc
diff --git a/cc/trees/property_tree_unittest.cc b/cc/trees/property_tree_unittest.cc
index b2f5a78d41464fec090eea1226cdf8b141f58716..d85f0be7affa5460961eb92216d35ea9795664d5 100644
--- a/cc/trees/property_tree_unittest.cc
+++ b/cc/trees/property_tree_unittest.cc
@@ -421,28 +421,6 @@
 DIRECT_AND_SERIALIZED_PROPERTY_TREE_TEST_F(
     PropertyTreeTestComputeTransformRoot);
 
-class PropertyTreeTestSetNeedsUpdate : public PropertyTreeTest {
- protected:
-  void StartTest() override {
-    PropertyTrees property_trees;
-    TransformTree& tree = property_trees.transform_tree;
-    TransformNode contents_root;
-    contents_root.source_node_id = 0;
-    contents_root.id = tree.Insert(contents_root, 0);
-    tree.SetTargetId(contents_root.id, 0);
-    SetupTransformTreeForTest(&tree);
-
-    EXPECT_FALSE(tree.needs_update());
-    tree.SetRootTransformsAndScales(0.6f, 1.f, gfx::Transform(), gfx::PointF());
-    EXPECT_TRUE(tree.needs_update());
-    tree.set_needs_update(false);
-    tree.SetRootTransformsAndScales(0.6f, 1.f, gfx::Transform(), gfx::PointF());
-    EXPECT_FALSE(tree.needs_update());
-  }
-};
-
-DIRECT_AND_SERIALIZED_PROPERTY_TREE_TEST_F(PropertyTreeTestSetNeedsUpdate);
-
 class PropertyTreeTestComputeTransformChild : public PropertyTreeTest {
  protected:
   void StartTest() override {