Move remaining content test code into the content namespace.

content/test/net/url_request_slow_download_job.h

Index: content/test/net/url_request_slow_download_job.h
===================================================================
--- content/test/net/url_request_slow_download_job.h	(revision 164732)
+++ content/test/net/url_request_slow_download_job.h	(working copy)
@@ -16,6 +16,8 @@
 #include "base/memory/weak_ptr.h"
 #include "net/url_request/url_request_job.h"
 
+namespace content {
+
 class URLRequestSlowDownloadJob : public net::URLRequestJob {
  public:
   // Test URLs.
@@ -94,4 +96,6 @@
   base::WeakPtrFactory<URLRequestSlowDownloadJob> weak_factory_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_TEST_NET_URL_REQUEST_SLOW_DOWNLOAD_JOB_H_