Revert "Make PathGeoBuilder use consistent iterators."

This reverts commit 9c8a16bb1ef5b6663c7b2c98fc2ec7f6499f72a8.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Make PathGeoBuilder use consistent iterators.
> 
> Previously it used a degenerate consuming iterator to determine the whether there were multiple contours. This was inconsistent with the tessellating step.
> 
> Bug: chromium:788500
> Change-Id: I3938c69cf40bc551acdb8d5fa9b54d2c96e2a460
> Reviewed-on: https://skia-review.googlesource.com/76961
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,brianosman@google.com

Change-Id: I18005ea2d7ba88c66334f110a5a74c6d82e4ab90
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:788500
Reviewed-on: https://skia-review.googlesource.com/77440
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
3 files changed