Remove ui-enable-dip option

ui/compositor/dip_util.h

Index: ui/compositor/dip_util.h
diff --git a/ui/compositor/dip_util.h b/ui/compositor/dip_util.h
index 0667052748465143e4a64e947a3187e88152525e..bf4cdfe1a6538a8e37bfc386658f75c9778e7d5d 100644
--- a/ui/compositor/dip_util.h
+++ b/ui/compositor/dip_util.h
@@ -16,26 +16,8 @@ class Rect;
 }  // namespace gfx
 
 namespace ui {
-namespace test {
-
-// A scoped object allows you to temporarily enable DIP
-// in the unit tests.
-class COMPOSITOR_EXPORT ScopedDIPEnablerForTest {
- public:
-  ScopedDIPEnablerForTest();
-  ~ScopedDIPEnablerForTest();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ScopedDIPEnablerForTest);
-};
-
-}  // namespace test
-
 class Layer;
 
-// True if DIP is enabled.
-COMPOSITOR_EXPORT bool IsDIPEnabled();
-
 COMPOSITOR_EXPORT float GetDeviceScaleFactor(const Layer* layer);
 
 // Utility functions that convert point/size/rect between