The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4d7a9ea81684ff23d235642fa97f5bbd110911f5

commit 4d7a9ea81684ff23d235642fa97f5bbd110911f5
Author: Matthew Jones <mdjones@chromium.org>
Date: Fri Aug 18 00:24:13 2017

Fold LayoutManagerDocument into LayoutManager

This change removes an unnecessary abstraction on the LayoutManager.
Since all usages display web contents, there is no reason to have
that logic separate; if that changes, simpler abstractions can be
made. This change also removes several unused internal classes and
methods.

BUG= 755788 

Change-Id: Ib2b6206639a7bb085c9d988c41a5a27aad2b5714
Reviewed-on: https://chromium-review.googlesource.com/616068
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#495394}
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/FullscreenActivity.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManager.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerChrome.java
[delete] https://crrev.com/96b4c361ec7f4e354f8252d7a46aba6194f66f71/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerDocument.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabLayoutManager.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
[modify] https://crrev.com/4d7a9ea81684ff23d235642fa97f5bbd110911f5/chrome/android/java_sources.gni