Move geometric types to a separate, more lightweight target.

ui/gfx/geometry/rect_base.h

Index: ui/gfx/geometry/rect_base.h
diff --git a/ui/gfx/rect_base.h b/ui/gfx/geometry/rect_base.h
similarity index 98%
rename from ui/gfx/rect_base.h
rename to ui/gfx/geometry/rect_base.h
index 412836ced1904bed3da6a8ec33cd602fc01feaf1..b0a9b06a6b52263612d496047918fd76870e8d61 100644
--- a/ui/gfx/rect_base.h
+++ b/ui/gfx/geometry/rect_base.h
@@ -9,8 +9,8 @@
 // rectangles with negative width and/or height), but there will be assertions
 // in the operations (such as Contains()) to complain in this case.
 
-#ifndef UI_GFX_RECT_BASE_H_
-#define UI_GFX_RECT_BASE_H_
+#ifndef UI_GFX_GEOMETRY_RECT_BASE_H_
+#define UI_GFX_GEOMETRY_RECT_BASE_H_
 
 #include <string>
 
@@ -171,4 +171,4 @@ class GFX_EXPORT RectBase {
 
 }  // namespace gfx
 
-#endif  // UI_GFX_RECT_BASE_H_
+#endif  // UI_GFX_GEOMETRY_RECT_BASE_H_