Remove Navigation Transitions from Chromium

This was a good experiment, but there's nobody currently driving this iteration, and the code is intrusive, accumulating technical debt around it.

BUG=370696
Committed: https://crrev.com/cd24f7e8d5d05cae491599aea8bab20da4e7e6ac
Cr-Commit-Position: refs/heads/master@{#330380}

[dglazkov, 2015-05-15 23:16:56]

dglazkov@chromium.org changed reviewers:
+ jam@chromium.org, jochen@chromium.org, oysteine@chromium.org,
zhenw@chromium.org

[dglazkov, 2015-05-15 23:17:14]

PTAL.

[jochen (gone - plz use gerrit), 2015-05-15 23:26:12]

lgtm

[oystein (OOO til 10th of July), 2015-05-16 01:02:24]

lgtm, thanks for this!

[dglazkov, 2015-05-18 14:56:49]

The CQ bit was checked by dglazkov@chromium.org

[commit-bot: I haz the power, 2015-05-18 14:57:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1144463003/100001

[commit-bot: I haz the power, 2015-05-18 15:05:37]

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

[commit-bot: I haz the power, 2015-05-18 15:05:38]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[jam, 2015-05-18 15:42:06]

lgtm

[dglazkov, 2015-05-18 15:46:37]

The CQ bit was checked by dglazkov@chromium.org

[commit-bot: I haz the power, 2015-05-18 15:46:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1144463003/100001

[commit-bot: I haz the power, 2015-05-18 15:54:28]

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

[commit-bot: I haz the power, 2015-05-18 15:54:30]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[dglazkov, 2015-05-18 15:57:00]

dglazkov@chromium.org changed reviewers:
+ dcheng@chromium.org, jschuh@chromium.org

[dglazkov, 2015-05-18 15:57:30]

+jschuh,dcheng -- need your signature for content/common/frame_messages.h

[jschuh, 2015-05-18 16:27:43]

ipc security lgtm. (notes: message/code removal)

[dglazkov, 2015-05-18 16:37:02]

The CQ bit was checked by dglazkov@chromium.org

[commit-bot: I haz the power, 2015-05-18 16:37:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1144463003/100001

[commit-bot: I haz the power, 2015-05-18 20:00:10]

Committed patchset #7 (id:100001)

[commit-bot: I haz the power, 2015-05-18 22:40:48]

Patchset 7 (id:??) landed as
https://crrev.com/cd24f7e8d5d05cae491599aea8bab20da4e7e6ac
Cr-Commit-Position: refs/heads/master@{#330380}