Remove duplicate Encoding API tests

Remove duplicate Encoding API tests

Several of the fast/encoding/api tests were upstreamed to
web-platform-tests and can be deleted. A few were redundant
already or had cases shuffled between files.

fast/encoding/api            imported/web-platform-tests/encoding
-----------------------------------------------------------------
basics.html                  api-basics.html
byte-order-marks.html        textdecoder-byte-order-marks.html
encoding-labels.html         textdecoder-labels.html
encoding-names.html          textdecoder-labels.html
end-of-file.html             textdecoder-fatal-streaming.html
fatal-flag.html              textdecoder-fatal.html
legacy-encode.html           textencoder-constructor-non-utf.html
replacement-encoding.html    api-replacement-encodings.html
streaming-decode.html        textdecoder-streaming.html
textdecoder-ignorebom.html   textdecoder-ignorebom.html
textdecoder-labels.html      textdecoder-labels.html
utf16-surrogates-encode.html textencoder-utf16-surrogates.html
utf16-surrogates.html        textdecoder-utf16-surrogates.html
utf8-surrogates.html         api-surrogates-utf8.html

Also rename resources/shared.js to resources/encodings.js to
align with web-platform-tests's equivalent.

R=dpranke@chromium.org
BUG=493927
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197525

[jsbell, 2015-06-19 21:49:14]

dpranke@ - ptal?

[Dirk Pranke, 2015-06-19 23:53:53]

lgtm

[jsbell, 2015-06-20 02:41:07]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2015-06-20 02:41:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1196733003/1

[commit-bot: I haz the power, 2015-06-20 03:40:33]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197525