title: iOS AdMob memory leak?
body: <p>I just started using <code>AdMob</code> but I noticed that, after running it for about an hour, it's accumulated 50MB! Yikes. I thought about releasing it but I can't since I am using  <code>ARC</code>. Any ideas? I'm using the getting started code provided by google:</p>
  
  <pre><code>GADBannerView *bannerView_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner];
  
  CGRect newFrame = CGRectMake(self.scroller.frame.origin.x,self.scroller.frame.origin.y + 70,self.scroller.frame.size.width,self.scroller.frame.size.height);
  [self.scroller setFrame:newFrame];
  
  bannerView_.adUnitID = @"XXXXX";
  bannerView_.rootViewController = self;
  
  [bannerView_ setFrame:CGRectMake(0,
                                   20,
                                   bannerView_.bounds.size.width,
                                   bannerView_.bounds.size.height)];
  
  [self.view addSubview:bannerView_];
  
  [bannerView_ loadRequest:[GADRequest request]];
  </code></pre>