Fix includes in util/testharness.h.

This CL removes unused headers included by util/testharness.h, adds
precise includes where the build breaks, and fixes style errors in the
edited files.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189331061

db/db_bench.cc

@@ -5,11 +5,10 @@
 #include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include "db/db_impl.h"
-#include "db/version_set.h"
 #include "leveldb/cache.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"
+#include "leveldb/filter_policy.h"
 #include "leveldb/write_batch.h"
 #include "port/port.h"
 #include "util/crc32c.h"

util/coding.h

@@ -12,7 +12,9 @@
 
 #include <stdint.h>
 #include <string.h>
+
 #include <string>
+
 #include "leveldb/slice.h"
 #include "port/port.h"
 

util/coding_test.cc

@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include "util/coding.h"
+#include <vector>
 
+#include "util/coding.h"
 #include "util/testharness.h"
 
 namespace leveldb {

util/testharness.cc

@@ -4,11 +4,15 @@
 
 #include "util/testharness.h"
 
-#include <string>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
+#include <string>
+#include <vector>
+
+#include "leveldb/env.h"
+
 namespace leveldb {
 namespace test {
 

util/testharness.h

@@ -7,10 +7,10 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+
 #include <sstream>
-#include "leveldb/env.h"
-#include "leveldb/slice.h"
-#include "util/random.h"
+
+#include "leveldb/status.h"
 
 namespace leveldb {
 namespace test {