Revert "Ensure we properly set PageTransition for iframes."

Revert "Ensure we properly set PageTransition for iframes."

This reverts commit 735aa03be45990a5e2feb3c38087e6f76eb920ac AKA refs/heads/master@{#326404}
Reverting because it caused a bug which is currently the top crasher on canary.

Original description: Ensure we properly set PageTransition for iframes.
 We currently don't set subframe navigations as manual when it isn't the first
 navigation of the iframe. Also, we don't propagate the state correctly in the
 case of a cross-process transition.

 Original Review URL: https://codereview.chromium.org/1002953004

 Original Cr-Commit-Position: refs/heads/master@{#326404}

TBR=creis@chromium.org, japhet@chromium.org
BUG=464014, 480839
Committed: https://crrev.com/94144d4dd7f594efcc4efd41a7ae424e7078a338
Cr-Commit-Position: refs/heads/master@{#327100}

[ncarter (slow), 2015-04-27 16:55:00]

nick@chromium.org changed reviewers:
+ creis@chromium.org, japhet@chromium.org

[ncarter (slow), 2015-04-27 16:55:24]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-27 16:55:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1108863002/1

[commit-bot: I haz the power, 2015-04-27 17:00:10]

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

[commit-bot: I haz the power, 2015-04-27 17:00:11]

Try jobs failed on following builders:
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[ncarter (slow), 2015-04-27 17:31:06]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-27 17:32:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1108863002/20001

[commit-bot: I haz the power, 2015-04-27 19:21:58]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-27 19:22:54]

Patchset 2 (id:??) landed as
https://crrev.com/94144d4dd7f594efcc4efd41a7ae424e7078a338
Cr-Commit-Position: refs/heads/master@{#327100}