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Locally modify Polymer 2 to exclude dir-mixin.html, since it is unnecessary
currently (we don't directly* use any :dir() CSS rules), and also causes a
performance regression (more notice-able in chrome://md-user-manager), due to a
Regex running over a fairly large amount of text (because of inlined PNG background
images).

*The only usage of :dir() was in paper-input-container.html, which is still used
by ChromeOS <gaia-input> element. Modified <paper-input-container> to directly
use :host-context instead. Also :dir() is not implemented in Chrome, so we should
not be using it in our own code anyway.

Ideally the usage of this mixin should be exposed as a Polymer option, so that
we don't need to manually modify our local Polymer 2 copy.

Bug: 899603
Change-Id: Ia20535fb2adb2c9a6bebf3046e4405a4ca31af6c
Reviewed-on: https://chromium-review.googlesource.com/c/1306515Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604759}