Update Jinja2 from 2.8 to 2.10

This is mainly for taking performance improvement of jinja2.
http://jinja.pocoo.org/docs/2.10/changelog/#version-2-10

Manually edited files:
  README.chromium
  get_jinja2.sh

And I regenerate build/android/test_runner.pydeps

* For the record,
With Jinja 2.10, running time of idl_compiler for generate_bindings_core_v8_interfaces is like below on Z840 Linux.
5.050s
4.945s
5.077s

With Jinja 2.8, running time of idl_compiler for generate_bindings_core_v8_interfaces is like below on Z840 Linux.
6.675s
6.575s
6.574s

Bug: 821256
Change-Id: I127e3db94edb22e3ac22a3662872d99b4b91c2a8
Reviewed-on: https://chromium-review.googlesource.com/917930
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@google.com>
Cr-Original-Commit-Position: refs/heads/master@{#543075}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 9f3b732a24a2989447fe1fea3ebdc908872088e6
36 files changed