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Since the devtools server is running for each content shell browser process, the user doesn't specify a server port anymore. Instead I let the system pick. This made it necessary to plumb the data back from net::HttpServer.

For now I only added Windows and Linux UI. Mac UI will be done later.

BUG=90445
Review URL: https://chromiumcodereview.appspot.com/10837177

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150808 0039d316-1c4b-4281-b951-d872f2087c98