[safe browsing] Remove stale BINHASH code.

Safe browsing stopped requesting the download hash list a few years ago,
and the histograms from r150369 (Delete stale chunks from safe-browsing
downloads store) no longer show any hits at all.  Remove remaining stale
code.

BUG=108130

Review URL: https://codereview.chromium.org/172393005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252630 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252630
Revert 251581 "Move SigninNamesOnIOThread to observing SigninMan..."

> Move SigninNamesOnIOThread to observing SigninManager.
> 
> As SigninNamesOnIOThread is currently listening for signin-related
> notifications from all Profiles, this change is non-trivial. This CL adds the
> ability to observe SigninManagerFactory's creation of SigninManagers.
> SigninNamesOnIOThread uses this hook to add itself as an observer of every
> created SigninManager, removing itself as an observer of a particular
> SigninManager when that SigninManager is shut down. At the time that
> SigninNamesOnIOThread releases its resources, it removes itself as an observer
> of any SigninManagers that it is currently observing and removes itself as an
> observer of SigninManagerFactory.
> 
> BUG=333997
> TBR=thakis
> 
> Review URL: https://codereview.chromium.org/132743004

TBR=blundell@chromium.org

Review URL: https://codereview.chromium.org/175683003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252631 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252631
Icons for a11y and touch optimised keyboard.


BUG=332073

Review URL: https://codereview.chromium.org/167043002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252632 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252632