[webapi] Update 3 TCs for iap

- Update 3 TCs for iap
- Failure analysis: "In App Purchase" feature is not allowed in China

Impacted tests(approved): new 0, update 3, delete 0
Unit test platform: [Android]
Unit test result summary: pass 0, fail 3, block 0
[usecase-webapi] Fix style issue and add icon in Viewport

 Impacted TCs num: New 0, Update 4, Delete: 0
 Unit test platform: Android
 Unit test result: Pass 4, Fail 0, Block 0
[sample] Remove unreferenced CanvasTest.ttf
Merge pull request #825 from zqzhang/CanvasTest.ttf

[sample] Remove unreferenced CanvasTest.ttf
[embedding] Delete one unnecessary test case

Impacted tests(approved): new 0, update 0, delete 1
Unit test platform: [Android]
Unit test result summary: pass 83, fail 18, block 4
Merge pull request #826 from zhuyongyong/yongzhu/embedding-tests/delete

[embedding] Delete one unnecessary test case
[uecase-webapi][XWALK-2251] Improve nfc usecase

 -Change status to approved
 -Add clearLog function and setEnvironment function
 -Removed redundant test functions
 -Modified AddMessage function
 -Improve test steps and excepted results
 -Failure analysis: 1. startPoll() method does not work, can not change nfc hardware to polling mode, then nfc tag and peer device can not found.
                    2. When ran NFCTag::readNDEF(), NFCTag::writeNDEF(), NFCPeer::sendNDEF() method, neither callback was invoked.

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 1, block 0
Merge pull request #824 from Honry/Honry/usecase-fix-style-issue

[usecase-webapi] Fix style issue and add icon in Viewport
[sample] Remove useless resource files

 Impacted test case: New 0, Update 3, Delete 0
 Unit test platform: Tizen ivi
 Unit test result: Pass 3, Fail 0, Block 0
Merge pull request #827 from Honry/Honry/sample-icon-config

Remove useless resource files and add icon in Viewport
[usecase-wrt][XWALK-1163/1491/1171] Add tcs for usecase

[Detailed commit message (if have)]
Impacted TCs num(approved): New 1, update 1, deleted 0
Impacted TCs num(designed): New 2, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 2, Fail 0, Blocked 0
[sample] Replace PNG_512x512_318Kb_BBB.png with ryb-100x100.png

- This image is only referenced by Screen Orientation sample,
  which makes a colorful view.
- Improve Screen Orientation sample code and format.
- Remove unnecessary COPYING files.
[wrt] Update cases for wrt android
Merge pull request #830 from linshen/wrt/shen/add-usecase-feature

[usecase-wrt][XWALK-1163/1491/1171] Add tcs for usecase
Merge pull request #828 from haoxli/haoxli/usecase/webapi-nfc

[uecase-webapi][XWALK-2251] Improve nfc usecase
Merge pull request #833 from kangxu/kangxu/wrt/wrtcases/fix

[wrt] Update cases for wrt android
Merge pull request #829 from zqzhang/PNG_512x512_318Kb_BBB.png

[sample] Replace PNG_512x512_318Kb_BBB.png with ryb-100x100.png
Merge pull request #816 from yunxliu/yunxliu/webapi/iap_modify

[webapi] Update 3 TCs for iap