MediaRouter: Remove an unused member in SampleMediaRouteProvider

Change-Id: I9eb7d16a49017697e2586dc1988e4411566d65d4
diff --git a/samples/Support7Demos/src/com/example/android/supportv7/media/SampleMediaRouteProvider.java b/samples/Support7Demos/src/com/example/android/supportv7/media/SampleMediaRouteProvider.java
index 8c5d226..37cfa74 100644
--- a/samples/Support7Demos/src/com/example/android/supportv7/media/SampleMediaRouteProvider.java
+++ b/samples/Support7Demos/src/com/example/android/supportv7/media/SampleMediaRouteProvider.java
@@ -442,7 +442,6 @@
                     callback.onError("Failed to open " + uri.toString(), null);
                 }
             }
-            mEnqueueCount +=1;
             return true;
         }
 
@@ -650,4 +649,4 @@
             }
         }
     }
-}
\ No newline at end of file
+}