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Revert of sync: Add non-blocking type encryption support (https://codereview.chromium.org/423193002/)

Reason for revert:
Both LSAN and Valgrind complains about leaks in the tests.

Original issue's description:
> sync: Add non-blocking type encryption support
> 
> Introduces the framework for dealing with sync encryption in
> non-blocking types.  Unlike directory sync types, non-blocking type
> encryption only encrypts data before it is sent to the server.
> Encrypting the data on-disk is a separate problem.
> 
> Adds code to the ModelTypeSyncWorker so it can access the directory's
> cryptographer (through a CryptographerProvider interface) and use it to
> encrypt entities before it sends them to the server.  If the
> cryptographer is unable to encrypt with the desired key, the worker will
> not commit until the cryptographer returns to a good state.
> 
> Adds the concept of a "desired encryption key" to the data type state.
> When the cryptographer key to be used to encrypt a type changes, this
> will be reflected in the data type state.  The ModelTypeSyncProxy is
> responsible for ensuring that all items which have not yet been
> encrypted with this desired key are enqueued for commit.
> 
> Makes the ModelTypeSyncWorker, EntityTracker, and ModelTypeSyncProxy
> collaborate on the management of undecryptable (inapplicable) updates.
> The EntityTracker keeps track of their version numbers and content, and
> prevents the committing of new items to the server until the
> inapplicable update has been dealt with.  The ModelTypeSyncProxy is
> responsible for saving inapplicable updates across restarts.
> 
> This CL alone is not enough to enable encryption support for
> non-blocking types.  It requires additional code to hook up the
> ModelTypeSyncWorkers to receive cryptographer events.  This will be
> added in a future commit.  In the meantime, this CL includes plenty
> of unit tests to verify the functionality that's being added.
> 
> BUG=351005
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287428

TBR=zea@chromium.org,stanisc@chromium.org,rlarocque@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=351005

Review URL: https://codereview.chromium.org/442623002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287433 0039d316-1c4b-4281-b951-d872f2087c98