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This change removes the uninclusive term "master" from the name of this
class. This is a better name anyways due to the symmetry with the
DeclarativeUserScriptManager class.

Bug: 1097189
Change-Id: Ie7bd46087103b30d52a32b397eda2a1097d99316
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258357
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Sean Topping <seantopping@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781150}