[Merge M50] aw: Remove WindowAndroid caching

[Merge M50] aw: Remove WindowAndroid caching

Caching sCachedWindowAndroid is incorrect since it is possible for the
one Application context to be wrapped differently.

There is no point in caching ActivityWindowAndroid either due to the way
ResourcesContextWrapperFactory works.

So remove caching altogether and always create a new WindowAndroid
instance.

BUG=597526
Review URL: https://codereview.chromium.org/1831373003

Cr-Commit-Position: refs/heads/master@{#383408}
(cherry picked from commit d1c68aa675d8d5586e2cda7df1ad56d5e4129e59)

Committed: https://chromium.googlesource.com/chromium/src/+/030335581832763bf521dbe3e5cf7cd87b6d5f94

[boliu, 2016-03-26 01:19:21]

Description was changed from

==========
[Merge M50] aw: Remove WindowAndroid caching

Caching sCachedWindowAndroid is incorrect since it is possible for the
one Application context to be wrapped differently.

There is no point in caching ActivityWindowAndroid either due to the way
ResourcesContextWrapperFactory works.

So remove caching altogether and always create a new WindowAndroid
instance.

BUG=597526

Review URL: https://codereview.chromium.org/1831373003

Cr-Commit-Position: refs/heads/master@{#383408}
(cherry picked from commit d1c68aa675d8d5586e2cda7df1ad56d5e4129e59)
==========

to

==========
[Merge M50] aw: Remove WindowAndroid caching

Caching sCachedWindowAndroid is incorrect since it is possible for the
one Application context to be wrapped differently.

There is no point in caching ActivityWindowAndroid either due to the way
ResourcesContextWrapperFactory works.

So remove caching altogether and always create a new WindowAndroid
instance.

BUG=597526

Review URL: https://codereview.chromium.org/1831373003

Cr-Commit-Position: refs/heads/master@{#383408}
(cherry picked from commit d1c68aa675d8d5586e2cda7df1ad56d5e4129e59)

Committed:
https://chromium.googlesource.com/chromium/src/+/030335581832763bf521dbe3e5cf...
==========

[boliu, 2016-03-26 01:19:23]

Committed patchset #1 (id:1) manually as
030335581832763bf521dbe3e5cf7cd87b6d5f94.