Remove unused utility methods.

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 31f5343c3f913aa43a32c3e361e73d5855868294..a28d8b19891a3a64babf7f72bc87675268458f19 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -2966,6 +2966,20 @@ TEST_F(LayerTreeHostCommonDrawRectsTest,
             drawing_layer->drawable_content_rect());
 }
 
+static bool projection_clips(const gfx::Transform& t, const gfx::RectF& r) {

[danakj, 2017/03/14 20:14:11]

nit: ProjectionClips

[Peter Mayo, 2017/03/17 00:35:54]

Done.

+  gfx::Transform inv_t(Inverse(t));

[danakj, 2017/03/14 20:14:11]

nit: inverted (or some not-shortened word/s)

[Peter Mayo, 2017/03/17 00:35:54]

Done.

+  bool clipped = false;
+  if (!clipped)
+    MathUtil::ProjectPoint(inv_t, r.top_right(), &clipped);
+  if (!clipped)
+    MathUtil::ProjectPoint(inv_t, r.origin(), &clipped);
+  if (!clipped)
+    MathUtil::ProjectPoint(inv_t, r.bottom_right(), &clipped);
+  if (!clipped)
+    MathUtil::ProjectPoint(inv_t, r.bottom_left(), &clipped);
+  return clipped;
+}
+
 TEST_F(LayerTreeHostCommonDrawRectsTest, DrawRectsForPerspectiveUnprojection) {
   // To determine visible rect in layer space, there needs to be an
   // un-projection from surface space to layer space. When the original
@@ -2988,12 +3002,9 @@ TEST_F(LayerTreeHostCommonDrawRectsTest, DrawRectsForPerspectiveUnprojection) {
 
   // Sanity check that un-projection does indeed cause w < 0, otherwise this
   // code is not testing the intended scenario.
-  bool clipped;
   gfx::RectF clipped_rect = MathUtil::MapClippedRect(
       layer_to_surface_transform, gfx::RectF(layer_content_rect));
-  MathUtil::ProjectQuad(
-      Inverse(layer_to_surface_transform), gfx::QuadF(clipped_rect), &clipped);
-  ASSERT_TRUE(clipped);
+  ASSERT_TRUE(projection_clips(layer_to_surface_transform, clipped_rect));
 
   // Only the corner of the layer is not visible on the surface because of being
   // clipped. But, the net result of rounding visible region to an axis-aligned