Remove obsolete friend declarations for MSVC.

Remove obsolete friend declarations for MSVC.

These friend declarations were added because MSVC had a bug around the
visibility of nested classes. They are no longer necessary.

BUG=617504
Committed: https://crrev.com/3d588ed27838ec6df972ccdf662ab0ed39ec9514
Cr-Commit-Position: refs/heads/master@{#398255}

[Yuta Kitamura, 2016-06-07 06:26:00]

The CQ bit was checked by yutak@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-06-07 06:26:16]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2041273002/1

[Yuta Kitamura, 2016-06-07 06:26:54]

yutak@chromium.org changed reviewers:
+ haraken@chromium.org, tzik@chromium.org

[Yuta Kitamura, 2016-06-07 06:26:54]

yutak@chromium.org changed required reviewers:
+ tzik@chromium.org

[Yuta Kitamura, 2016-06-07 06:26:55]

tzik & haraken: PTAL?
+haraken for platform/ approval.

[haraken, 2016-06-07 06:27:57]

LGTM

[tzik, 2016-06-07 06:29:03]

lgtm

[commit-bot: I haz the power, 2016-06-07 06:48:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-07 06:48:50]

Dry run: Try jobs failed on following builders:
  win8_chromium_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_ng/...)

[Yuta Kitamura, 2016-06-07 07:37:53]

The CQ bit was checked by yutak@chromium.org

[commit-bot: I haz the power, 2016-06-07 07:38:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2041273002/1

[commit-bot: I haz the power, 2016-06-07 08:24:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-07 08:26:09]

Description was changed from

==========
Remove obsolete friend declarations for MSVC.

These friend declarations were added because MSVC had a bug around the
visibility of nested classes. They are no longer necessary.

BUG=617504
==========

to

==========
Remove obsolete friend declarations for MSVC.

These friend declarations were added because MSVC had a bug around the
visibility of nested classes. They are no longer necessary.

BUG=617504

Committed: https://crrev.com/3d588ed27838ec6df972ccdf662ab0ed39ec9514
Cr-Commit-Position: refs/heads/master@{#398255}
==========

[commit-bot: I haz the power, 2016-06-07 08:26:11]

Patchset 1 (id:??) landed as
https://crrev.com/3d588ed27838ec6df972ccdf662ab0ed39ec9514
Cr-Commit-Position: refs/heads/master@{#398255}