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Currently BrowserActionsBarIncognitoTest.IncognitoMode crashes when the
RuntimeHostPermissions feature is enabled since the test calls
ExtensionActionViewController::GetIcon with a null web-contents. This ends up
calling ExtensionActionViewController::GetPageInteractionStatus() which accesses
the null web-contents.

Fix this by using InProcessBrowserTest::CreateBrowser which waits for the
browser to have a valid tab.

BUG=888158

Change-Id: I7b763ff54f2a0d65e199582a9ab00549e549f8c0
Reviewed-on: https://chromium-review.googlesource.com/1239458
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593719}