[webapi][XWALK-2533] Fix bug for mediarenderer

- Fix bug for mediarenderer

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 1, fail 0, block 0
[webapi]Increase timeout for align-items-005.htm to overcome this case block issue.

Impacted tests(approved):new 0,update 1,delete 0
Unit test platform:[Android]
Unit test result summary:pass 0,fail 1,block 0
[usecase-webapi] Remove SpeechSynthesis from tests.android.xml & tests.tizen.xml

 - The feature is not resolved.
Merge pull request #1013 from yunxiaoxie/yunxiaoxie/speechsynthesisfixconfig

[usecase-webapi] Remove SpeechSynthesis from tests.android.xml & tests.t...
Merge pull request #1003 from chenxix/chenxi/misc-uiautomation/modify-flexible

 [webapi] Increase timeout attribute for align-items-005.htm to overcome this case block issue.
Merge pull request #996 from yunxliu/yunxliu/webapi/mediarenderer

[webapi][XWALK-2533] Fix bug for mediarenderer
[usecase] Update install command in inst.wgt/xpk.py
Merge pull request #1014 from Honry/Honry/usecase/update-install-command

[usecase] Update install command in inst.wgt/xpk.py