Revert of "Converted LayerImpl::bounds() to return SizeF."

cc/trees/tree_synchronizer_unittest.cc

Index: cc/trees/tree_synchronizer_unittest.cc
diff --git a/cc/trees/tree_synchronizer_unittest.cc b/cc/trees/tree_synchronizer_unittest.cc
index fcc7cd6538c123517b21f67693dadfc5eea4dd57..faa86ce907366d4adcc2e9fe243c5305a10e17b9 100644
--- a/cc/trees/tree_synchronizer_unittest.cc
+++ b/cc/trees/tree_synchronizer_unittest.cc
@@ -361,7 +361,7 @@ TEST_F(TreeSynchronizerTest, SyncSimpleTreeAndProperties) {
   EXPECT_EQ(first_child_opacity,
             layer_impl_tree_root->children()[0]->opacity());
 
-  gfx::SizeF second_layer_impl_child_bounds =
+  gfx::Size second_layer_impl_child_bounds =
       layer_impl_tree_root->children()[1]->bounds();
   EXPECT_EQ(second_child_bounds.width(),
             second_layer_impl_child_bounds.width());