GitLab

Notable changes:
* ios/web/webui/crw_web_ui_page_builder.mm has a block that had a
   __block reference to itself. Before ARC __block means "do not retain
   when being captured in a block", but with ARC it is captured. So I
   added an additional variable of __weak __block type instead.

* One WeakNSObject in mojo_facade.h could not be removed because it is
  included from non-ARC code. WeakNSObject is functional in ARC but is
  not preferred. Filed crbug.com/639326 to track future removal of
  this.

BUG=639327
TEST=None

Review-Url: https://codereview.chromium.org/2340343002
Cr-Commit-Position: refs/heads/master@{#419458}