The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2504f838819d321e4bf62e3da29ec258260356e3

commit 2504f838819d321e4bf62e3da29ec258260356e3
Author: arthursonzogni <arthursonzogni@chromium.org>
Date: Tue Jun 27 09:18:56 2017

Fix wrong ui::PAGE_TRANSITION_FORWARD_BACK in tests.

This CL modify some unit tests such that the PageTransition qualifier:
ui::PAGE_TRANSITION_FORWARD_BACK matches when the browser askes for a
new navigation and the renderer navigates.

Context: https://crrev.com/2958573002/
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

BUG=736772

Review-Url: https://codereview.chromium.org/2957783002
Cr-Commit-Position: refs/heads/master@{#482581}

[modify] https://crrev.com/2504f838819d321e4bf62e3da29ec258260356e3/content/browser/frame_host/navigation_controller_impl_unittest.cc
[modify] https://crrev.com/2504f838819d321e4bf62e3da29ec258260356e3/content/browser/frame_host/render_frame_host_manager_unittest.cc
[modify] https://crrev.com/2504f838819d321e4bf62e3da29ec258260356e3/content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc
[modify] https://crrev.com/2504f838819d321e4bf62e3da29ec258260356e3/content/browser/web_contents/web_contents_impl_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b757c63d2e76e4ea078e3ca4ca873d5b594073ea

commit b757c63d2e76e4ea078e3ca4ca873d5b594073ea
Author: arthursonzogni <arthursonzogni@chromium.org>
Date: Mon Jul 10 16:16:14 2017

PageTransition: Remove unreached code.

Remove a block of code that used to detect a incorrect PageTransition
and to replace it by its correct value.
Apparently, this block is no more reached. This CL removes it.
Furthermore, a test is added. It replays the steps one had to do to
reach this block of code.

BUG=736772,740461
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2961903003
Cr-Commit-Position: refs/heads/master@{#485287}

[modify] https://crrev.com/b757c63d2e76e4ea078e3ca4ca873d5b594073ea/content/browser/frame_host/navigation_controller_impl_browsertest.cc
[modify] https://crrev.com/b757c63d2e76e4ea078e3ca4ca873d5b594073ea/content/renderer/render_frame_impl.cc

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I still have the CL that checks when PAGE_TRANSITION_FORWARD_BACK is dropped:
https://bugs.chromium.org/p/chromium/issues/detail?id=736772#c4

I run it again, the DCHECK is still reached in a bunch of tests:
https://ci.chromium.org/buildbot/tryserver.chromium.linux/cast_shell_linux/535669

This is low priority, so I am not going to spend time on it.