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The rule disallows == in favor of ===, and != in favor of !==, which
matches the Google JS styleguide (which Chromium's JS styleguide
inherits from).

The stricter comparison checks actually revealed a bug in service.js,
which is also fixed in this CL.

Bug: 720034
Change-Id: I2288fe1395c930bf6e541681b500c7ee66c80f97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1959788Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723614}