Move geometric types to a separate, more lightweight target.

ui/gfx/geometry/size_conversions.h

Index: ui/gfx/geometry/size_conversions.h
diff --git a/ui/gfx/size_conversions.h b/ui/gfx/geometry/size_conversions.h
similarity index 73%
copy from ui/gfx/size_conversions.h
copy to ui/gfx/geometry/size_conversions.h
index af68195b55bdfdb236a4dbff494bbe1ec4db255f..96fb79f93c29ac1f66dabefaf922233adb462770 100644
--- a/ui/gfx/size_conversions.h
+++ b/ui/gfx/geometry/size_conversions.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_GFX_SIZE_CONVERSIONS_H_
-#define UI_GFX_SIZE_CONVERSIONS_H_
+#ifndef UI_GFX_GEOMETRY_SIZE_CONVERSIONS_H_
+#define UI_GFX_GEOMETRY_SIZE_CONVERSIONS_H_
 
-#include "ui/gfx/size.h"
-#include "ui/gfx/size_f.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/geometry/size_f.h"
 
 namespace gfx {
 
@@ -21,4 +21,4 @@ GFX_EXPORT Size ToRoundedSize(const SizeF& size);
 
 }  // namespace gfx
 
-#endif  // UI_GFX_SIZE_CONVERSIONS_H_
+#endif  // UI_GFX_GEOMETRY_SIZE_CONVERSIONS_H_