content/browser: Move more files into the content namespace.

content/browser/cross_site_request_manager.cc

Index: content/browser/cross_site_request_manager.cc
diff --git a/content/browser/cross_site_request_manager.cc b/content/browser/cross_site_request_manager.cc
index a4c2c32a466f8e19cc10c85bfd58e784a6d87df6..2fa38b185ab3769b48274774c3bc6ba951c8fbe3 100644
--- a/content/browser/cross_site_request_manager.cc
+++ b/content/browser/cross_site_request_manager.cc
@@ -6,6 +6,8 @@
 
 #include "base/memory/singleton.h"
 
+namespace content {
+
 bool CrossSiteRequestManager::HasPendingCrossSiteRequest(int renderer_id,
                                                          int render_view_id) {
   base::AutoLock lock(lock_);
@@ -36,3 +38,5 @@ CrossSiteRequestManager::~CrossSiteRequestManager() {}
 CrossSiteRequestManager* CrossSiteRequestManager::GetInstance() {
   return Singleton<CrossSiteRequestManager>::get();
 }
+
+}  // namespace content