GitLab

This CL contains:
 * Expose resulting type of Bind as MakeUnboundRunType.
 * Refactor testing::CreateFunctor using base::Bind.
 * Remove generate_gmock_mutant.py.
 * Change argument ordering of testing::CreateFunctor to align to
   base::Bind.
 * Remove LATE_OBJECT_BINDING support, which no one use.

BUG=554299

Review URL: https://codereview.chromium.org/1680643002

Cr-Commit-Position: refs/heads/master@{#374689}