Fix a misuse of pragma disable/default in a header file.

This may override the enable/disable of this warning in an other file which include base_helpers.h.

[email protected], [email protected]
BUG=

Review URL: https://chromiumcodereview.appspot.com/20353002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@214573 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed