Set UA override flag for Renderer-initiated NavigationRequest

Set UA override flag for Renderer-initiated NavigationRequest

Use last committed NavigationEntry instead of the pending endtry
(which can be null) to have the user agent override flag stick
across navigations. The entry can affect navigation entry id
but it is safe to replace it since the id used for browser-initiated
navigation only.

BUG=734772
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Icb34f55af82bafde5a3c0e1457fa25c1172db9d0
Reviewed-on: https://chromium-review.googlesource.com/541277
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>;
Reviewed-by: Camille Lamy <clamy@chromium.org>;
Cr-Original-Commit-Position: refs/heads/master@{#482311}
Review-Url: https://codereview.chromium.org/2966573003 .
Cr-Commit-Position: refs/branch-heads/3112@{#496}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/790356ce6c03c372d5fe2310f4e319265441f231

[jam, 2017-06-29 23:18:07]

Description was changed from

==========
Set UA override flag for Renderer-initiated NavigationRequest

Use last committed NavigationEntry instead of the pending endtry
(which can be null) to have the user agent override flag stick
across navigations. The entry can affect navigation entry id
but it is safe to replace it since the id used for browser-initiated
navigation only.

BUG=734772

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Icb34f55af82bafde5a3c0e1457fa25c1172db9d0
Reviewed-on: https://chromium-review.googlesource.com/541277
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#482311}
(cherry picked from commit c7616c7db94822e05489004042923b0df02882ed)
==========

to

==========
Set UA override flag for Renderer-initiated NavigationRequest

Use last committed NavigationEntry instead of the pending endtry
(which can be null) to have the user agent override flag stick
across navigations. The entry can affect navigation entry id
but it is safe to replace it since the id used for browser-initiated
navigation only.

BUG=734772

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Icb34f55af82bafde5a3c0e1457fa25c1172db9d0
Reviewed-on: https://chromium-review.googlesource.com/541277
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#482311}
Review-Url: https://codereview.chromium.org/2966573003 .
Cr-Commit-Position: refs/branch-heads/3112@{#496}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/790356ce6c03c372d5fe2310f4e3...
==========

[jam, 2017-06-29 23:18:09]

Committed patchset #1 (id:1) manually as
790356ce6c03c372d5fe2310f4e319265441f231.