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When building with jumbo the compiler sees two
operator==, declared in the files:
content/common/media/media_devices.h
content/browser/indexed_db/scopes/scopes_lock_manager.cc

Therefore, it throws an error. This commit solves the
issue by replacing the operator with a lamdba doing
the same operation.

Change-Id: I285a95a77ac55d2502d146316da12339de277fc9
Reviewed-on: https://chromium-review.googlesource.com/1169468
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582086}