Split analysis server's HttpAnalysisServer into two classes.

Split analysis server's HttpAnalysisServer into two classes.

Behaviours of the HttpAnalysisServer which are independent of the
WebSocket transport mechanism have been moved to a new class,
SocketServer, which will also be used when the transport mechanism is
stdio.

GetHander now holds a reference to the SocketServer rather than the
AnalysisServer, so that we don't need to go to extra effort to update
it when the AnalysisServer is created.

R=brianwilkerson@google.com, jwren@google.com

Committed: https://code.google.com/p/dart/source/detail?r=35061

[jwren, 2014-04-14 23:51:47]

On 2014/04/14 22:31:42, Paul Berry wrote:

LGTM

[Brian Wilkerson, 2014-04-15 00:08:55]

Not sure how this affects extensibility, but we can always look at that again
later. LGTM.

[Paul Berry, 2014-04-15 15:41:17]

Committed patchset #2 manually as r35061 (presubmit successful).