angler-fishThe Vulnerability History Project

Prefer ScopedNestableTaskAllower over manual save/restore

      Cleanup.  Changes various calls sites to use the
ScopedNestableTaskAllower class to save/restore nestable task
state.

BUG=None
TEST=Existing unit tests
R=jar@chromium.org, scottbyer@chromium.org, sky@chromium.org, akalin@chromium.org, rsleevi@chromium.org, brettw@chromium.org, tony@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9384024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@121914 0039d316-1c4b-4281-b951-d872f2087c98
    
commit b5717a4f9f66283a9fe04ae1f9a3a89920d5b6b0
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