Remove usage of S.p.charCodeAt from uri.js

Remove usage of S.p.charCodeAt from uri.js

We were using both String.prototype.charCodeAt and
String.prototype.charAt.

BUG=v8:4224
LOG=N
R=adamk, littledan
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Committed: https://crrev.com/b5adc2f6b41e0f21db5b39ccaf6c4c487e29eda5
Cr-Commit-Position: refs/heads/master@{#29208}

[arv (Not doing code reviews), 2015-06-22 21:45:35]

PTAL

https://codereview.chromium.org/1204483003/diff/1/src/uri.js
File src/uri.js (right):

https://codereview.chromium.org/1204483003/diff/1/src/uri.js#newcode167
src/uri.js:167: uri = TO_STRING_INLINE(uri);
The spec calls this as a first step. This is good for us because now we don't
have to check on every access below.

[adamk, 2015-06-22 21:47:41]

lgtm

[arv (Not doing code reviews), 2015-06-22 22:27:24]

The CQ bit was checked by arv@chromium.org

[commit-bot: I haz the power, 2015-06-22 22:27:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1204483003/1

[commit-bot: I haz the power, 2015-06-22 23:43:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-22 23:43:31]

Patchset 1 (id:??) landed as
https://crrev.com/b5adc2f6b41e0f21db5b39ccaf6c4c487e29eda5
Cr-Commit-Position: refs/heads/master@{#29208}