Refine some public files in xwalk runtime.

The public files under xwalk/runtime/browser should be
located to the correct compiling path and the unused codes
related to Android port in the resource dispatcher host
delegation file should be removed. This fix is to refine
the corresponding files in xwalk runtime.

BUG=https://crosswalk-project.org/jira/browse/XWALK-620
[Runtime] Polish a Sqlite table selection statement.

The name 'registered_event' is not explictly declaired which table it
comes from in previous SQL statement.
This PR explictly clarifies column of which table is selected.
[Android][SysApss] Fixed getMemoryInfo to support Android 4.0 and below.

1. The original implementation uses an API avaible since API level 16. Change
the implementation to reading file "/proc/meminfo" when the target system
is Android 4.0 and below.
2. The spec http://device-capabilities.sysapps.org/#memory requires to return
byte instead of KB. So change the unit to byte.
Merge pull request #1240 from itlodge/fix_memory

[Android][Extension] Fixed getMemoryInfo to support Android 4.0 and belo...
Merge pull request #1244 from ShDavidliu/resource_dispatcher

Refine some public files in xwalk runtime.
Roll chromium to aac7580

Bring in 4 commits:
d51e985 [Tizen] Dynamically load the camera driver at runtime
c1b54ed [Tizen] Add the EGL backend in VAVDA for Tizen Mobile.
55288b3 Revert "x11: Fix a few touch-event related issues:"
1127c91 [Tizen][Performance] Enable Accelerated 2D Canvas.
Merge pull request #1246 from shaochangbin/sql

[Runtime] Polish a Sqlite table selection statement.
Merge pull request #1254 from jchen10/camera_dlopen

Roll chromium to aac7580
[application] Remove "application launch from local path" support

We rely fully on main document as application entry point (see
http://anssiko.github.io/runtime/app-lifecycle.html).

The deprecated "application launch from local path" code path support should be removed as
1) it is not used but brings extra complexity
2) it does not provide the logic which we rely on in many places within xwalk (for instance initialization of main_runtime_ or non-persistent main document implementation).