Error pages: Break retain cycle NativeContent/StaticHTMLViewController

Error pages: Break retain cycle NativeContent/StaticHTMLViewController

StaticHTMLViewController retains the generator.
The generator is implementated by ErrorPageContent, which retain the
StaticHTMLViewController.
This leads to a leak and the WKWebView is never released.

BUG=693178
Review-Url: https://codereview.chromium.org/2695593011
Cr-Commit-Position: refs/heads/master@{#451609}
(cherry picked from commit fc155c2704ad95817d98efb4c3dbec239c4c17cb)

Review-Url: https://codereview.chromium.org/2704383003 .
Cr-Commit-Position: refs/branch-heads/2987@{#635}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/b8d01bfd581d8285158819ab99ebbbf59afa6704

[Olivier, 2017-02-22 08:37:24]

Description was changed from

==========
Error pages: Break retain cycle NativeContent/StaticHTMLViewController

StaticHTMLViewController retains the generator.
The generator is implementated by ErrorPageContent, which retain the
StaticHTMLViewController.
This leads to a leak and the WKWebView is never released.

BUG=693178

Review-Url: https://codereview.chromium.org/2695593011
Cr-Commit-Position: refs/heads/master@{#451609}
(cherry picked from commit fc155c2704ad95817d98efb4c3dbec239c4c17cb)
==========

to

==========
Error pages: Break retain cycle NativeContent/StaticHTMLViewController

StaticHTMLViewController retains the generator.
The generator is implementated by ErrorPageContent, which retain the
StaticHTMLViewController.
This leads to a leak and the WKWebView is never released.

BUG=693178

Review-Url: https://codereview.chromium.org/2695593011
Cr-Commit-Position: refs/heads/master@{#451609}
(cherry picked from commit fc155c2704ad95817d98efb4c3dbec239c4c17cb)

Review-Url: https://codereview.chromium.org/2704383003 .
Cr-Commit-Position: refs/branch-heads/2987@{#635}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/b8d01bfd581d8285158819ab99eb...
==========

[Olivier, 2017-02-22 08:37:25]

Committed patchset #1 (id:1) manually as
b8d01bfd581d8285158819ab99ebbbf59afa6704.