Allow disk writes while checking webview version pref.

Allow disk writes while checking webview version pref.

Since N, the preference directory will be created if it doesn't exist
when getSharedPreferences is called. Enable disk writes to prevent a
strict mode violation; this will only happen the first time an app is
started up.

BUG=716219
Review-Url: https://codereview.chromium.org/2846963005
Cr-Commit-Position: refs/heads/master@{#468052}
(cherry picked from commit fe20a56ce5c36f7a29880586d67ca5e82aea3756)

Review-Url: https://codereview.chromium.org/2865733002 .
Cr-Commit-Position: refs/branch-heads/3029@{#806}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/33e41155e73f47258881df86fc6ce6ee33626ed3

[Torne, 2017-05-05 19:38:00]

Description was changed from

==========
Allow disk writes while checking webview version pref.

Since N, the preference directory will be created if it doesn't exist
when getSharedPreferences is called. Enable disk writes to prevent a
strict mode violation; this will only happen the first time an app is
started up.

BUG=716219

Review-Url: https://codereview.chromium.org/2846963005
Cr-Commit-Position: refs/heads/master@{#468052}
(cherry picked from commit fe20a56ce5c36f7a29880586d67ca5e82aea3756)
==========

to

==========
Allow disk writes while checking webview version pref.

Since N, the preference directory will be created if it doesn't exist
when getSharedPreferences is called. Enable disk writes to prevent a
strict mode violation; this will only happen the first time an app is
started up.

BUG=716219

Review-Url: https://codereview.chromium.org/2846963005
Cr-Commit-Position: refs/heads/master@{#468052}
(cherry picked from commit fe20a56ce5c36f7a29880586d67ca5e82aea3756)

Review-Url: https://codereview.chromium.org/2865733002 .
Cr-Commit-Position: refs/branch-heads/3029@{#806}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/33e41155e73f47258881df86fc6c...
==========

[Torne, 2017-05-05 19:38:01]

Committed patchset #1 (id:1) manually as
33e41155e73f47258881df86fc6ce6ee33626ed3.