mus: Rename .*PointerWatcher.* to .*PointerDownWatcher.*.

ash/common/shell_delegate.h

Index: ash/common/shell_delegate.h
diff --git a/ash/common/shell_delegate.h b/ash/common/shell_delegate.h
index 11ffaf3c826b439043092a72b6d920c28033c104..b603675d864ee1ce97fa17f937b18c8617c71e44 100644
--- a/ash/common/shell_delegate.h
+++ b/ash/common/shell_delegate.h
@@ -41,7 +41,7 @@ class AccessibilityDelegate;
 class GPUSupport;
 class MediaDelegate;
 class NewWindowDelegate;
-class PointerWatcherDelegate;
+class PointerDownWatcherDelegate;
 class SessionStateDelegate;
 class ShelfDelegate;
 class ShelfModel;
@@ -123,8 +123,8 @@ class ASH_EXPORT ShellDelegate {
   // Creates a media delegate. Shell takes ownership of the delegate.
   virtual MediaDelegate* CreateMediaDelegate() = 0;
 
-  virtual std::unique_ptr<PointerWatcherDelegate>
-  CreatePointerWatcherDelegate() = 0;
+  virtual std::unique_ptr<PointerDownWatcherDelegate>
+  CreatePointerDownWatcherDelegate() = 0;
 
   // Creates a menu model for the |wm_shelf| and optional shelf |item|.
   // If |item| is null, this creates a context menu for the desktop or shelf.