refactoring mouse lock to support pepper and WebKit

ppapi/examples/mouse_lock/mouse_lock.cc

Index: ppapi/examples/mouse_lock/mouse_lock.cc
diff --git a/ppapi/examples/mouse_lock/mouse_lock.cc b/ppapi/examples/mouse_lock/mouse_lock.cc
index 6a934ba26348c8a632e6b3b05290e96e8f9c57e6..4f7f51e9978d9f3d95ce1fa9a7cbe2f00d92f7a4 100644
--- a/ppapi/examples/mouse_lock/mouse_lock.cc
+++ b/ppapi/examples/mouse_lock/mouse_lock.cc
@@ -75,8 +75,9 @@ class MyInstance : public pp::Instance, public pp::MouseLock {
             LockMouse(callback_factory_.NewRequiredCallback(
                 &MyInstance::DidLockMouse));
           }
+          return true;
         }
-        return true;
+        return false;
       }
       default:
         return false;