Clean up some warnings about unused code.

src/views/mac/skia_mac.mm

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #import <Cocoa/Cocoa.h>
 #include "SkApplication.h"
 
 int main(int argc, char *argv[]) {
     signal(SIGPIPE, SIG_IGN);
-    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+    /*NSAutoreleasePool* pool = */ [[NSAutoreleasePool alloc] init];
     application_init();
     int retVal =  NSApplicationMain(argc, (const char **)argv);
     
 #if 0
     // we don't expect NSApplicationMain to return. See our applicationShouldTerminate handler.
     application_term();
     [pool release];
 #endif
     return retVal;
 }