Remove dip scale dependency from ui::WindowAndroid

ui/android/window_android.h

Index: ui/android/window_android.h
diff --git a/ui/android/window_android.h b/ui/android/window_android.h
index 6a8fd155c764a2ffc39fac31bdb1bfbf83bdc8a6..d65235ccd5e99c85eb9a520f73a215720fc7fa2c 100644
--- a/ui/android/window_android.h
+++ b/ui/android/window_android.h
@@ -35,8 +35,8 @@ class UI_ANDROID_EXPORT WindowAndroid : public ViewAndroid {
 
   static bool RegisterWindowAndroid(JNIEnv* env);
 
-  // The content offset is used to translate snapshots to the correct part of
-  // the window.
+  // The content offset in CSS pixels. It is used together with device scale
+  // factor to translate snapshots to the correct part of the window.
   void set_content_offset(const gfx::Vector2dF& content_offset) {
     content_offset_ = content_offset;
   }