Move remaining content test code into the content namespace.

content/test/net/url_request_slow_http_job.cc

Index: content/test/net/url_request_slow_http_job.cc
===================================================================
--- content/test/net/url_request_slow_http_job.cc	(revision 164732)
+++ content/test/net/url_request_slow_http_job.cc	(working copy)
@@ -10,6 +10,7 @@
 
 static const char kMockHostname[] = "mock.slow.http";
 
+namespace content {
 namespace {
 
 // This is the file path leading to the root of the directory to use as the
@@ -73,3 +74,5 @@
 void URLRequestSlowHTTPJob::RealStart() {
   URLRequestMockHTTPJob::Start();
 }
+
+}  // namespace content