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

chrome/browser/safe_browsing/ping_manager.h

Index: chrome/browser/safe_browsing/ping_manager.h
diff --git a/chrome/browser/safe_browsing/ping_manager.h b/chrome/browser/safe_browsing/ping_manager.h
index 63148ea9f3eaf1efea4039d9f963dc089000f2d8..969889d27cdf7efe54454b5f2570b3c98262e2d2 100644
--- a/chrome/browser/safe_browsing/ping_manager.h
+++ b/chrome/browser/safe_browsing/ping_manager.h
@@ -27,6 +27,7 @@ class SSLInfo;
 class URLRequestContextGetter;
 }  // namespace net
 
+namespace safe_browsing {
 
 class SafeBrowsingPingManager : public net::URLFetcherDelegate {
  public:
@@ -109,4 +110,6 @@ class SafeBrowsingPingManager : public net::URLFetcherDelegate {
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingPingManager);
 };
 
+}  // namespace safe_browsing
+
 #endif  // CHROME_BROWSER_SAFE_BROWSING_PING_MANAGER_H_