Revert 248827 "android: Migrate old content readback to use asyn..."

Breaks android ToT, and the pairing change downstream is not ready yet.

> android: Migrate old content readback to use async readback (and delegated renderer)
> 
> This patch removes the use of a helper context for content readback.  Instead,
> we use the async readback API.
> 
> This patch is also setting delegated renderer as the default for android.
> 
> android= https://chrome-internal-review.googlesource.com/#/c/152377/
> 
> BUG=326363
> TBR=sievers
> NOTRY=true
> 
> Review URL: https://codereview.chromium.org/143803004

TBR=powei@chromium.org

Review URL: https://codereview.chromium.org/149653004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248976 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248976
[Password Manager] Move access of PrefService into PasswordManagerDelegateImpl

This is part of a change to remove direct access to Profile from password
manager code for componetiziation.

BUG=335107
R=blundell@chromium.org

Review URL: https://codereview.chromium.org/155753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248977 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248977