Fix hunk lost in merge.

layout/base/nsIPresShell.h

@@ -1102,6 +1102,13 @@ public:
   float GetXResolution() { return mXResolution; }
   float GetYResolution() { return mYResolution; }
 
+  /**
+   * Dispatch a mouse move event based on the most recent mouse position if
+   * this PresShell is visible. This is used when the contents of the page
+   * moved (aFromScroll is false) or scrolled (aFromScroll is true).
+   */
+  virtual void SynthesizeMouseMove(PRBool aFromScroll) = 0;
+
   /**
    * Refresh observer management.
    */