[Runtime] Fix launch issue for widget applications that don't have
'content' element in config.xml.

Per Widget spec, the occurrences of 'content' element can be zero or one.
If there is no 'content' in config.xml, we should still be able to launch
widget application by the default 'index.html' path

BUG=XWALK-1109
Merge pull request #1667 from shaochangbin/content-src-issue

[Runtime] Fix launch issue for widget applications that don't have 'content' element in config.xml.
[Tizen Mobile] Remove AppcoreContext.

xwalk_launcher_tizen.cc directly use appcore package in shared process mode, no
matter either mobile or ivi. So this PR removes this legacy code.
Merge pull request #1677 from ds-hwang/remove_appcore

[Tizen Mobile] Remove AppcoreContext.
[Tizen] Specify and ship the proper licenses in the spec file.

Now that we do not care about Tizen 2.x support anymore, we can uncomment
out the lines in the spec file that ship and define the right licenses for
the Crosswalk package.

BUG=XWALK-229
Merge pull request #1673 from rakuco/fix-licensing-spec-files

[Tizen] Specify and ship the proper licenses in the spec file.
DEPS.xwalk: Roll chromium-crosswalk (6ed4b3f -> 15cca62).
Roll blink-crosswalk (26982f4 -> 23bf155).

Chromium
15cca62 Merge pull request #134 from wang16/pak_res_raw
cd2b81c Merge pull request #135 from xingnan/webaudio-flag-revert
8e139e6 Revert "[Android] Enable Web Audio on x86 -- part 3"
9a2002d [Android] Allow intercepter to extract paks

Blink
23bf155 Merge pull request #9 from ds-hwang/webgl_msaa
ddc7a36 [TEMP][IVI] WebGL: Turn off MSAA.
Merge pull request #1679 from ds-hwang/rollover

DEPS.xwalk: Roll chromium-crosswalk (6ed4b3f -> 15cca62).
Bump version to 5.34.97.0
[Android] Package xwalk.apk as resource in xwalk_core_library

This is step 2 of getting rid of assets in xwalk_core_library.
To use paks as res/raw, the idea is to generate an xml in res/values
when creating xwalk_core_library, the xml contains a string-array
to describe all the paks will be put in res/raw.
XWalkViewDelegate will try to load the xml first, and intercept
ResourceExtractor if the resource to extract is on the list.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1085