Squashed 'src/leveldb/' changes from 936b461..e991315

e991315 Merge upstream LevelDB 1.15.
0cfb990 Release LevelDB 1.15
02ac9f1 Merge upstream LevelDB 1.14.
0b9a89f Release LevelDB 1.14

git-subtree-dir: src/leveldb
git-subtree-split: e991315d7fe4ca84a98902578106cbffa3dcccfd

util/testharness.cc

@@ -38,7 +38,7 @@ int RunAllTests() {
 
   int num = 0;
   if (tests != NULL) {
-    for (int i = 0; i < tests->size(); i++) {
+    for (size_t i = 0; i < tests->size(); i++) {
       const Test& t = (*tests)[i];
       if (matcher != NULL) {
         std::string name = t.base;