gfx::Screen: Replace GetWindowUnderCursor() with IsWindowUnderCursor().

ui/gfx/screen.h

Index: ui/gfx/screen.h
diff --git a/ui/gfx/screen.h b/ui/gfx/screen.h
index 9352e792cb44a68357e32eb3ec57d8124544cf16..112d3d50ae195cba4d6d738954e498a3f35ce709 100644
--- a/ui/gfx/screen.h
+++ b/ui/gfx/screen.h
@@ -39,8 +39,8 @@ class GFX_EXPORT Screen {
   // Returns the current absolute position of the mouse pointer.
   virtual gfx::Point GetCursorScreenPoint() = 0;
 
-  // Returns the window under the cursor.
-  virtual gfx::NativeWindow GetWindowUnderCursor() = 0;
+  // Returns true if the cursor is directly over |window|.
+  virtual bool IsWindowUnderCursor(gfx::NativeWindow window) = 0;
 
   // Returns the window at the given screen coordinate |point|.
   virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) = 0;