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Also fix a dependency issue in
chromeos_test_support_without_gmock, make
ExtensionsTestSuite call
GLSurface::InitializeOneOffForTests(), and avoid
double-initializating Aura in app_shell.

BUG=405967

Review URL: https://codereview.chromium.org/468393005

Cr-Commit-Position: refs/heads/master@{#291607}