Prepare to get the multiprocess setting from WebViewDelegate.

Prepare to get the multiprocess setting from WebViewDelegate.

In future OS versions, we should fetch the multiprocess-enabled setting
from WebViewDelegate instead of querying the setting directly. Add the
skeleton code to get this from the delegate under a build version
condition.

BUG=684489
Review-Url: https://codereview.chromium.org/2645413002
Cr-Commit-Position: refs/heads/master@{#445705}
(cherry picked from commit acc84fbd540feec6c0fa6b2165b0da7eeb8d0456)

Review-Url: https://codereview.chromium.org/2649273004 .
Cr-Commit-Position: refs/branch-heads/2987@{#56}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/017527dfefa5007676c3acd72c957e8dda04742f

[Torne, 2017-01-24 13:49:51]

Description was changed from

==========
Prepare to get the multiprocess setting from WebViewDelegate.

In future OS versions, we should fetch the multiprocess-enabled setting
from WebViewDelegate instead of querying the setting directly. Add the
skeleton code to get this from the delegate under a build version
condition.

BUG=684489

Review-Url: https://codereview.chromium.org/2645413002
Cr-Commit-Position: refs/heads/master@{#445705}
(cherry picked from commit acc84fbd540feec6c0fa6b2165b0da7eeb8d0456)
==========

to

==========
Prepare to get the multiprocess setting from WebViewDelegate.

In future OS versions, we should fetch the multiprocess-enabled setting
from WebViewDelegate instead of querying the setting directly. Add the
skeleton code to get this from the delegate under a build version
condition.

BUG=684489

Review-Url: https://codereview.chromium.org/2645413002
Cr-Commit-Position: refs/heads/master@{#445705}
(cherry picked from commit acc84fbd540feec6c0fa6b2165b0da7eeb8d0456)

Review-Url: https://codereview.chromium.org/2649273004 .
Cr-Commit-Position: refs/branch-heads/2987@{#56}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/017527dfefa5007676c3acd72c95...
==========

[Torne, 2017-01-24 13:49:53]

Committed patchset #1 (id:1) manually as
017527dfefa5007676c3acd72c957e8dda04742f.