Move geometric types to a separate, more lightweight target.

ui/gfx/geometry/size_conversions.cc

Index: ui/gfx/geometry/size_conversions.cc
diff --git a/ui/gfx/size_conversions.cc b/ui/gfx/geometry/size_conversions.cc
similarity index 86%
rename from ui/gfx/size_conversions.cc
rename to ui/gfx/geometry/size_conversions.cc
index eacbeb4fc8dc178bc9ad7115cf4cbf3f802d0941..c924e86c9aee89280ab8ecb244172f6d21998009 100644
--- a/ui/gfx/size_conversions.cc
+++ b/ui/gfx/geometry/size_conversions.cc
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gfx/size_conversions.h"
+#include "ui/gfx/geometry/size_conversions.h"
 
-#include "ui/gfx/safe_integer_conversions.h"
+#include "ui/gfx/geometry/safe_integer_conversions.h"
 
 namespace gfx {