Fix stale reinit in the shader translator.

Fix stale reinit in the shader translator.

In some cases we would initialize, free, then re-initialize the
shader translator within the same initialized memory. The local
static tracking initialization would get stuck and we would fail
on subsequent calls. We can fix this by using a non-local static.

We ran into this problem in some unit tests which use the
in-process GPU, likely because of the single-process model.

BUG=344043
R=zmo@chromium.org, jbauman@chromium.org

Review URL: https://codereview.chromium.org/178043002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253205 0039d316-1c4b-4281-b951-d872f2087c98