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

components/safe_browsing_db/prefix_set.cc

Index: components/safe_browsing_db/prefix_set.cc
diff --git a/components/safe_browsing_db/prefix_set.cc b/components/safe_browsing_db/prefix_set.cc
index e6b4ecc029c7e3d9f7846691d8894d4e08fa2a30..f8a4f1aa3e4c105e30d672f851db92932a3ebed5 100644
--- a/components/safe_browsing_db/prefix_set.cc
+++ b/components/safe_browsing_db/prefix_set.cc
@@ -13,6 +13,8 @@
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 
+namespace safe_browsing {
+
 namespace {
 
 // |kMagic| should be reasonably unique, and not match itself across
@@ -76,8 +78,6 @@ size_t EstimateFinalCount(SBPrefix current_prefix, size_t current_count) {
 
 }  // namespace
 
-namespace safe_browsing {
-
 // For |std::upper_bound()| to find a prefix w/in a vector of pairs.
 // static
 bool PrefixSet::PrefixLess(const IndexPair& a, const IndexPair& b) {