Remove "using namespace" statements from headers

Remove "using namespace" statements from headers

It is bad practice to have "using namespace" statements in the headers as it
can change the lookup rules in unrelated implementation files.

This is also against Chromium coding style:
http://www.chromium.org/developers/coding-style/chromium-style-checker-errors#TOC-Using-namespace-in-a-header

R=esprehn, adamk

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165150

[esprehn, 2014-01-15 00:41:40]

build is broken?

[Inactive, 2014-01-15 00:49:10]

On 2014/01/15 00:41:40, esprehn wrote:
> build is broken?

I don't think so but the try bots are misbehaving. They still appear as yellow
even though I received the try-success emails.
The build with my patch looks OK:
http://build.chromium.org/p/tryserver.chromium/builders/mac_blink_rel/builds/...
http://build.chromium.org/p/tryserver.chromium/builders/linux_blink/builds/7482

[esprehn, 2014-01-15 00:49:50]

rslgtm

[commit-bot: I haz the power, 2014-01-15 01:19:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/134453006/1

[commit-bot: I haz the power, 2014-01-15 15:27:46]

Retried try job too often on linux_blink_rel for step(s)
blink_platform_unittests, webkit_lint, webkit_python_tests, webkit_tests,
webkit_unit_tests, wtf_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-15 16:10:19]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/134453006/200001

[commit-bot: I haz the power, 2014-01-15 17:38:22]

Change committed as 165150