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This should solve the pyauto compile error because MessagePumpX is actually an aura component, not a general x11 component.

Instead of being a Singleton, X11AtomCache should tie its lifetime to an aura::Env, which are reset in the unit tests whenever an X server is switched out.

BUG=128584, 129075
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10416020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138290 0039d316-1c4b-4281-b951-d872f2087c98