[Autofill] Distinguish between native field types and potentially HTML field types.

[Autofill] Distinguish between native field types and potentially HTML field types.

The Autofill code currently uses a single enum AutofillFieldType to describe all
field types.  However, several of the field type hints provided in the HTML
autocomplete specification do not map nicely onto the native (server-supported)
field types.

This CL replaces all uses of the AutofillFieldType enum with either
  (1) a new enum, NativeFieldType, for code that does not need to be
      aware of HTML field types
  (2) AutofillType, a wrapper type that will be able to wrap either a
      native field type or an HTML type hint.

TBR=estade@chromium.org

BUG=254682, 261978
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=216075

[Ilya Sherman, 2013-08-03 07:05:18]

Apologies for the giant CL.  It's pretty mechanical, though.  Note that it's
currently based on top of https://chromiumcodereview.appspot.com/21947003/

[Ilya Sherman, 2013-08-06 05:38:37]

Evan, PTAL at this guy, the mechanical support for [
https://chromiumcodereview.appspot.com/22009003/ ].

[Ilya Sherman, 2013-08-06 05:39:02]

On 2013/08/06 05:38:37, Ilya Sherman (Away Aug. 9-25) wrote:
> Evan, PTAL at this guy, the mechanical support for [
> https://chromiumcodereview.appspot.com/22009003/ ].

Erm, support for https://chromiumcodereview.appspot.com/22040002/

[Evan Stade, 2013-08-06 23:11:35]

spot-checked a number of files, rslgtm

[commit-bot: I haz the power, 2013-08-07 00:34:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/22009003/28001

[commit-bot: I haz the power, 2013-08-07 00:53:11]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[Ilya Sherman, 2013-08-07 01:08:18]

TBR zea for //chrome/browser/sync and joi for //components/webdata

[commit-bot: I haz the power, 2013-08-07 01:17:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/22009003/28001

[commit-bot: I haz the power, 2013-08-07 03:05:20]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[Ilya Sherman, 2013-08-07 04:56:54]

Committed patchset #8 manually as r216075 (presubmit successful).

[Jói, 2013-08-12 10:40:24]

//components/webdata LGTM