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We make the kWebAppFileHandlers key available on stable rather than
trunk.

The ExtensionFromWebApp unit tests now use a test fixture that sets up
a testing environment (by inheriting from ExtensionServiceTestBase).

This is a speculative fix for a bug (crbug.com/1062239) that seems to
have been introduced by a change to ConvertWebAppToExtension
(crrev.com/c/2087327).

The test WebAppFileHandlersAreCorrectlyConverted is re-enabled.

This CL replaces
https://chromium-review.googlesource.com/c/chromium/src/+/2108208

Bug: 1062239
Change-Id: I107a0731ab5b17faa51660384c10cab400e3cb7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120676
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753544}