Fix cookie_policy_browsertest.cc including net/url_request/url_request_context.cc instead of the header file.
Fix cookie_policy_browsertest.cc including net/url_request/url_request_context.cc
instead of the header file.

(using this bug because it actually fails to compile when net is a dll)
BUG=76997
TEST=none
Review URL: http://codereview.chromium.org/7054055

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@87884 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,ropik/chromium