Enable ManifestTest.AppLaunchContainer as it should be passing now.

BUG=47230
TEST=test passes
TBR=robertshield

Review URL: http://codereview.chromium.org/2844016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50553 0039d316-1c4b-4281-b951-d872f2087c98
  Extension* LoadAndExpectSuccess(const std::string& name) {
    std::string error;
    Extension* extension = LoadExtension(name, &error);
    EXPECT_TRUE(extension);
    EXPECT_EQ("", error);
    return extension;
  }

  Extension* LoadAndExpectSuccess(const std::string& name) {
    std::string error;
    Extension* extension = LoadExtension(name, &error);
    EXPECT_TRUE(extension);
    EXPECT_EQ("", error);
    return extension;
  }
