Fix gl_healper_benchmark.cc after r230043

Due to an oversight, the All target didn't build content tests anymore,
and so this file was missed in a recent refactoring.

TBR=jamesr@chromium.org

Review URL: https://codereview.chromium.org/47603009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231327 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231327
Add component unittests back to All target.

I missed this one when splitting the components.gyp in two

BUG=none
R=joi@chromium.org

Review URL: https://codereview.chromium.org/48803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231328 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231328