Move code in components/safe_browsing_db and chrome/browser/s_b/ under the safe_browsing namespace.

chrome/browser/safe_browsing/ping_manager.cc

Index: chrome/browser/safe_browsing/ping_manager.cc
diff --git a/chrome/browser/safe_browsing/ping_manager.cc b/chrome/browser/safe_browsing/ping_manager.cc
index 998013668e095995c405c787edc6b69adece5eb8..9f6f68203af7c8f29bcca8be057f10a56f9d91d1 100644
--- a/chrome/browser/safe_browsing/ping_manager.cc
+++ b/chrome/browser/safe_browsing/ping_manager.cc
@@ -33,6 +33,8 @@ const char kExtendedReportingUploadUrlSecure[] =
     "https://sb-ssl.google.com/safebrowsing/clientreport/chrome-certs";
 }  // namespace
 
+namespace safe_browsing {
+
 // SafeBrowsingPingManager implementation ----------------------------------
 
 // static
@@ -204,3 +206,5 @@ GURL SafeBrowsingPingManager::ThreatDetailsUrl() const {
   }
   return GURL(url);
 }
+
+}  // namespace safe_browsing