Merge 54867 - ChromeFrame currently overrides the request context for interce...

Merge 54867 - ChromeFrame currently overrides the request context for intercepting network requests and cookie requests to route them
over the automation channel. This adds needless complexity and race conditions between registering a request context for
a renderer process as the first one wins. 

We no longer override the request context in ChromeFrame. For cookie requests we look up the registered render view map
and on finding one we route the request over the automation channel.

Fixes bug http://code.google.com/p/chromium/issues/detail?id=51103 and
          http://code.google.com/p/chromium/issues/detail?id=36946

Bug=51103, 36946
Review URL: http://codereview.chromium.org/3036038

TBR=ananta@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=56791