Do not allow intents to initiate special char sequence handling.

This is a squash of the following jellybean commits backported to ICS:

- Prevent Intent from initiating special-char handling
  Ic5b042f620b10931fedcaf12bb58be2405bf7390

- Remember the flag suppressing special char handling
  Ie62a448675ac558ecdeea43da01082712edee35a

- Follow-up to Ie62a4486
  Idea7ae599e3a217ad656a304fbae26746d9f3284

(Consolidated commit message from maniac103)

Change-Id: If4d9cff84e5202a4a9693e9824acebf1da2afa88