The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0aa77e4298f78f240c03703d7260eb750bc4d549

commit 0aa77e4298f78f240c03703d7260eb750bc4d549
Author: Michael Thiessen <mthiesse@chromium.org>
Date: Thu Mar 22 20:25:48 2018

Remove VrShell feature flag, clean up browsing enabled state.

Removes the long unused VrShell feature flag and unifies the code that
checks whether VR browsing is enabled.

Also moves a bunch of static functions around (I'm trying to keep static
functions above the constructor, and private functions below in an
effort to make the code more readable...). I'll probably pull a lot of
the statics out into their own file soon...

Bug:  822810 
Change-Id: Ia9523151310ef9525f3e1f3f5b8e5b5c9dcd42ba
Reviewed-on: https://chromium-review.googlesource.com/972438
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Biao She <bshe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545222}
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellDelegate.java
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/android/javatests/src/org/chromium/chrome/browser/vr_shell/TestVrShellDelegate.java
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/android/javatests/src/org/chromium/chrome/browser/vr_shell/WebVrInputTest.java
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/browser/about_flags.cc
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/browser/android/chrome_feature_list.cc
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/browser/android/vr/vr_shell.cc
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/browser/android/vr/vr_shell.h
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/0aa77e4298f78f240c03703d7260eb750bc4d549/chrome/common/chrome_features.cc