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GUID-related tests have been flaky since introduction and recent
investigations suggest that the underlying issue is FakeServer's lack of
sending sync invalidations for certain APIs like InjectEntity().

This patch modifies FakeServer to actually issue invalidations and
removes some now redundant (and undesired) calls to
TriggerSyncForModelTypes().

Assumes this fixes the flakiness, all tests are reenabled.

Bug: 1014086
Change-Id: Ie0f597c024646586b9ec6c3dfbb761a86dadaad2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879293Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710271}