Add content_unittests to the dependencies of the aura_builder target.

Review URL: https://codereview.chromium.org/11088061

git-svn-id: http://src.chromium.org/svn/trunk/src/build@161347 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -633,6 +633,7 @@
             '../chrome/chrome.gyp:interactive_ui_tests',
             '../chrome/chrome.gyp:unit_tests',
             '../content/content.gyp:content_browsertests',
+            '../content/content.gyp:content_unittests',
             '../ppapi/ppapi_internal.gyp:ppapi_unittests',
             '../remoting/remoting.gyp:remoting_unittests',
             '../ui/aura/aura.gyp:*',