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Rename the target to web_test_common_mojom target and make it a public
dependency of web_test_common, in order to treat them as one big build
target.

The power_monitor_test mojom is for browsertests so separate it into
content_browsertests_mojom, and depend on it from content shell (which
makes the impl) and from content_browsertests (which calls it).

TBR=thakis

Bug: 866140
Change-Id: Ibb40798e1afa94a3f8e983f921f9a5ce64d5882b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134622Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756102}