DEPS.xwalk: Roll chromium-crosswalk (c524f0d -> b93afe0).

b93afe0 Merge pull request #182 from rakuco/fix-angle-roll
7fe3516 [Temp] Fix ANGLE's hash after ab6d5f16.
6708f05 Merge pull request #181 from rakuco/roll-angle-deps
ab6d5f1 [Temp] Roll ANGLE to 5ac2ae3ea1f311be61955b2d554e8510474cf4f0.
8dffdb1 Merge pull request #178 from wang16/master
13884df [Android] Implement ScreenOrientation.unlock align with spec

This roll includes a change in the ANGLE hash in chromium-crosswalk that
allows us to get rid of the custom patch we were carrying for Tizen.
[Android] Fix virtual Override in ClientMapEntryUpdater

Base class doesn't have any parameter.
Merge pull request #2242 from rakuco/roll-cr-xwalk-for-tizen

DEPS.xwalk: Roll chromium-crosswalk (c524f0d -> b93afe0).
[Android] Rename version to xwalk_version in manifest and make it optional

According W3C manifest spec, 'version' field of manifest should be:
1) renamed to "xwalk_version"
2) optional
3) the "version" field should be handled if present, but issue a deprecation warning

BUG=https://crosswalk-project.org/jira/browse/XWALK-2053
Update codebase to use scoped_refptr<T>::get() rather
than implicit "operator T*"

It's going to be removed upstream at some point
http://code.google.com/p/chromium/issues/detail?id=110610
Merge pull request #2244 from darktears/scoped

Update codebase to use scoped_refptr<T>::get() rather
Merge pull request #2197 from PeterWangIntel/PR2053

[Android] "version" field in manifest should not be mandatory and should...
Merge pull request #2243 from darktears/fix-client-map-android

[Android] Fix virtual Override in ClientMapEntryUpdater
Fix org.xwalk.core.internal.xwview.test.loadTest#testContentUrl

Since M37 the test was failing. It was missing to change the declaration
of TestContentProvider the same way we did for the non internal xwalkview.

BUG=XWALK-2172
Merge pull request #2248 from darktears/fix-test

Fix org.xwalk.core.internal.xwview.test.loadTest#testContentUrl
Really fix org.xwalk.core.internal.xwview.test.loadTest#testContentUrl.

The <provider> tag in AndroidManifest.xml should be outside <activity>,
not inside it.

Pointy hat: darktears, rakuco.

BUG=XWALK-2172
Merge pull request #2249 from rakuco/really-fix-xwalk-2172

Really fix org.xwalk.core.internal.xwview.test.loadTest#testContentUrl.
Bump version to 8.37.183.0