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

cc/layers/layer_impl_unittest.cc

Index: cc/layers/layer_impl_unittest.cc
diff --git a/cc/layers/layer_impl_unittest.cc b/cc/layers/layer_impl_unittest.cc
index d9cfd9251744d5dfc950b10f02969d60a18487c1..1d8289f04a55273cdd8e5bb305f7bafb14a6ded6 100644
--- a/cc/layers/layer_impl_unittest.cc
+++ b/cc/layers/layer_impl_unittest.cc
@@ -682,7 +682,7 @@ TEST_F(LayerImplScrollTest, SetNewScrollbarParameters) {
   vertical_scrollbar->SetScrollLayerAndClipLayerByIds(
       layer()->id(), tree()->root_layer()->id());
 
-  float expected_vertical_maximum =
+  int expected_vertical_maximum =
       layer()->bounds().height() - tree()->root_layer()->bounds().height();
   EXPECT_EQ(expected_vertical_maximum, vertical_scrollbar->maximum());
   EXPECT_EQ(scroll_offset.y(), vertical_scrollbar->current_pos());
@@ -692,7 +692,7 @@ TEST_F(LayerImplScrollTest, SetNewScrollbarParameters) {
   horizontal_scrollbar->SetScrollLayerAndClipLayerByIds(
       layer()->id(), tree()->root_layer()->id());
 
-  float expected_horizontal_maximum =
+  int expected_horizontal_maximum =
       layer()->bounds().width() - tree()->root_layer()->bounds().width();
   EXPECT_EQ(expected_horizontal_maximum, horizontal_scrollbar->maximum());
   EXPECT_EQ(scroll_offset.x(), horizontal_scrollbar->current_pos());