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

chrome/browser/safe_browsing/chunk_range.cc

Index: chrome/browser/safe_browsing/chunk_range.cc
diff --git a/chrome/browser/safe_browsing/chunk_range.cc b/chrome/browser/safe_browsing/chunk_range.cc
index 024aa9b3c8b786dc70016d38f0470e36038f0424..de55e546bae7ff89869f8f1c5b5e4046de7d5808 100644
--- a/chrome/browser/safe_browsing/chunk_range.cc
+++ b/chrome/browser/safe_browsing/chunk_range.cc
@@ -13,6 +13,8 @@
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 
+namespace safe_browsing {
+
 ChunkRange::ChunkRange(int start) : start_(start), stop_(start) {
 }
 
@@ -112,3 +114,5 @@ bool IsChunkInRange(int chunk_number, const std::vector<ChunkRange>& ranges) {
 
   return false;
 }
+
+}  // namespace safe_browsing