Have component_strings be a hard dependency

As this target generates a header, it must be a hard dependency.

Review URL: https://codereview.chromium.org/102073007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239805 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239805