Remove RenderFrameHost pointer from ChooserController.

Remove RenderFrameHost pointer from ChooserController.

This change removes the raw RenderFrameHost pointer from
ChooserController and instead either computes necessary values (such as
the title) at construction time or stores a weak pointer to the object
derived from the RenderFrameHost.

BUG=697486
Review-Url: https://codereview.chromium.org/2746313002
Cr-Commit-Position: refs/heads/master@{#456876}
(cherry picked from commit f50d8d33c5da873242189cf73176d78a48549762)

Review-Url: https://codereview.chromium.org/2806603002 .
Cr-Commit-Position: refs/branch-heads/3029@{#616}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/7832e106ed7e343da9583d92f325faa5bc21a2ae

[Reilly Grant (use Gerrit), 2017-04-06 21:43:57]

Description was changed from

==========
Remove RenderFrameHost pointer from ChooserController.

This change removes the raw RenderFrameHost pointer from
ChooserController and instead either computes necessary values (such as
the title) at construction time or stores a weak pointer to the object
derived from the RenderFrameHost.

BUG=697486

Review-Url: https://codereview.chromium.org/2746313002
Cr-Commit-Position: refs/heads/master@{#456876}
(cherry picked from commit f50d8d33c5da873242189cf73176d78a48549762)
==========

to

==========
Remove RenderFrameHost pointer from ChooserController.

This change removes the raw RenderFrameHost pointer from
ChooserController and instead either computes necessary values (such as
the title) at construction time or stores a weak pointer to the object
derived from the RenderFrameHost.

BUG=697486

Review-Url: https://codereview.chromium.org/2746313002
Cr-Commit-Position: refs/heads/master@{#456876}
(cherry picked from commit f50d8d33c5da873242189cf73176d78a48549762)

Review-Url: https://codereview.chromium.org/2806603002 .
Cr-Commit-Position: refs/branch-heads/3029@{#616}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/7832e106ed7e343da9583d92f325...
==========

[Reilly Grant (use Gerrit), 2017-04-06 21:43:58]

Committed patchset #1 (id:1) manually as
7832e106ed7e343da9583d92f325faa5bc21a2ae.