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We now ensure cached passphrases are always used. In addition, encryption now
happens after configuration, allowing us to make use of the
pending_encrypted_types to know if we're waiting for encryption (which
affects how we prompt for passphrase). This is dependent on sync_setup_flow.cc
always calling EncryptDataTypes before configuring the new datatypes and setting
pending_encrypted_types_ appropriately, which then gets consumed on
SYNC_CONFIGURE_DONE.

BUG=91314
TEST=see bug

Review URL: http://codereview.chromium.org/7551024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95693 0039d316-1c4b-4281-b951-d872f2087c98