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Several mojom types are required to be stable over time by virtue of
their use in Content's page state serialization code.

Now that we have the [Stable] attribute with strict presubmit
enforcement, these types can all be marked [Stable] to ensure that they
aren't unwittingly broken by future changes.

Bug: 1070663
Change-Id: I7de41133eb8244f7dd8562fa713b6ad702c04ccb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220251
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773321}