[Telemetry] Use 127.0.0.1 instead of localhost for TemporaryHTTPServer.

[Telemetry] Use 127.0.0.1 instead of localhost for TemporaryHTTPServer.

On Windows 7, localhost is extremely slow. This simple change brings the moz
page cycler cycle time down from 1714ms to 122ms! That restores it to roughly
the level it was at prior to the shift to Telemetry.

BUG=196411
TEST=python tools\perf\run_multipage_benchmarks --browser=system page_cycler tools\perf\page_sets\page_cycler\moz.json
TBR=dtu@chromium.org
NOTRY=True

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=189043

[tonyg, 2013-03-19 16:49:56]

Committed patchset #1 manually as r189043 (presubmit successful).

[dtu, 2013-03-19 16:54:40]

Interesting... Why does that work!?! There are a bunch of other uses of
localhost in Telemetry, would it be useful to change all of them? lgtm

[tonyg, 2013-03-19 17:05:15]

On 2013/03/19 16:54:40, Dave Tu wrote:
> Interesting... Why does that work!?! There are a bunch of other uses of
> localhost in Telemetry, would it be useful to change all of them? lgtm

Not sure exactly why it works. It seems that it is the name resolution that is
slow. After banging my head against it for a while yesterday, I found this:
http://stackoverflow.com/questions/1726585/firefox-and-chrome-slow-on-localho...

XP and other platforms are definitely not affected. I didn't change the other
uses of localhost because they are either on other platforms or are one time
costs. This is the only one that affects all resources of page load.

[nduca, 2013-03-19 18:31:15]

holy cow