Fix ContextUtils test flakiness.

There was a race condition between Android tests calling
Application#onCreate and TestRunner#runTests which caused flakiness
in some of the UrlManagerTest* and other instrumentation tests.

Initialize the application object earlier so that it is always ready
when tests are run.

BUG=649224,637448

Review-Url: https://codereview.chromium.org/2363323003
Cr-Commit-Position: refs/heads/master@{#421256}
1 file changed