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* Make FixupUserInput() just return the fixed-up input text, since almost every
  caller wanted that (and the one that didn't, the HUP, will change in the
  future)
* Make some functions which took an AutocompleteInput object and then only cared
  about the text() just take a string16
* Eliminated HistoryURLProvider::RunAutocompletePasses(), since it had only one
  caller, and just inline the code into Start().  Also got rid of the
  |fixup_input_and_run_pass_1| variable that was never false.

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/312423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275540 0039d316-1c4b-4281-b951-d872f2087c98