Move content\browser\net to content namespace.

TBR=tfarina
Review URL: https://codereview.chromium.org/11343013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@164665 0039d316-1c4b-4281-b951-d872f2087c98

• content/browser/browser_main_loop.h[diff]
• content/browser/net/browser_online_state_observer.cc[diff]
• content/browser/net/browser_online_state_observer.h[diff]
• content/browser/net/view_blob_internals_job_factory.cc[diff]
• content/browser/net/view_blob_internals_job_factory.h[diff]
• content/browser/net/view_http_cache_job_factory.cc[diff]
• content/browser/net/view_http_cache_job_factory.h[diff]