Move prefix_set and parts of s_b_util into a new component safe_browsing_db.

components/safe_browsing_db/prefix_set.cc

Index: components/safe_browsing_db/prefix_set.cc
diff --git a/chrome/browser/safe_browsing/prefix_set.cc b/components/safe_browsing_db/prefix_set.cc
similarity index 99%
rename from chrome/browser/safe_browsing/prefix_set.cc
rename to components/safe_browsing_db/prefix_set.cc
index 7cd69e99177d3a8d1512614690c541cf319869be..e6b4ecc029c7e3d9f7846691d8894d4e08fa2a30 100644
--- a/chrome/browser/safe_browsing/prefix_set.cc
+++ b/components/safe_browsing_db/prefix_set.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/safe_browsing/prefix_set.h"
+#include "components/safe_browsing_db/prefix_set.h"
 
 #include <algorithm>
 
@@ -353,7 +353,8 @@ void PrefixSet::AddRun(SBPrefix index_prefix,
     deltas_.reserve(EstimateFinalCount(index_prefix, deltas_.size()));
   }
 
-  index_.push_back(std::make_pair(index_prefix, deltas_.size()));
+  index_.push_back(
+      std::make_pair(index_prefix, static_cast<uint32>(deltas_.size())));
   deltas_.insert(deltas_.end(), run_begin, run_end);
 }