Update OS X to use scoped_refptr<T>::get() rather than implicit "operator T*"

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 7e86f0541f021dbe62c725e3754f4403a74c8582..434977596f2e25aad15e711b9358ed7409b1e4bd 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -492,7 +492,7 @@ void RenderWidgetHostViewMac::EnableCoreAnimation() {
 
 bool RenderWidgetHostViewMac::CreateCompositedIOSurfaceAndLayer() {
   if (compositing_iosurface_layer_ &&
-      [compositing_iosurface_layer_ context] &&
+      [compositing_iosurface_layer_ context].get() &&
       compositing_iosurface_) {
     return true;
   }
@@ -1103,7 +1103,7 @@ void RenderWidgetHostViewMac::CopyFromCompositingSurfaceToVideoFrame(
       !compositing_iosurface_->HasIOSurface())
     return;
 
-  if (!target) {
+  if (!target.get()) {
     NOTREACHED();
     return;
   }