Bump Crosswalk to 34.0.1847.45

- Few build fixes due to renaming from upstream.

Author: Thiago Marcos P. Santos <thiago.santos@intel.com> :
- [SysApps] Fix component build
- [SysApps] Update StorageMonitor usage : Now we need
to ::Create() the instance explicitly before using.
[Android] Register JNI entries while libxwalkcore.so is loaded

Upstream moves RegisterLibraryLoaderEntryHook from content
to base, but the real registration is still done at
content::LibraryLoaded, which is missed in xwalk.

Add the callback back to fix the issue.
Merge pull request #1694 from wang16/next

[Android] Register JNI entries while libxwalkcore.so loaded