Fix chromeos build

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126737 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index 7a875933..cf3fd3dc 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -290,6 +290,7 @@
 #elif defined(OS_ANDROID)
     view_.reset(new WebContentsViewAndroid(this));
 #endif
+    (void)delegate;
   }
   CHECK(view_.get());