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This forbids production code depending on these targets, and enables
these targets to depend on other testonly targets in the future.

The only dependency prevented core:testing from being testonly was
from BlinkLeakDetector. Add Page::PrepareForLeakDetection() and
InternalSettingsPageSupplementStub (in page.h) to avoid the
dependency.

Change-Id: Ie22676a233d9b5c02cf3cde79629f4b84782b572
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829586Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701334}