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Fix asserts in gcm_client_impl_unittest

Many of the tests were calling helper methods that ASSERT, without
wrapping those calls with ASSERT_NO_FATAL_FAILURE to propagate any
assertion failures to the test. This patch wraps the calls.

BUG=none

Review-Url: https://codereview.chromium.org/2148163003
Cr-Commit-Position: refs/heads/master@{#405494}