Use of base::StringPairs appropriately in backend_unittest

net/disk_cache/backend_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/basictypes.h"
 #include "base/files/file_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/port.h"
 #include "base/run_loop.h"
+#include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/mock_entropy_provider.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "net/base/cache_type.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
@@ skipping 2723 matching lines @@
   EXPECT_EQ(0, cache_->GetEntryCount());
   EXPECT_NE(net::OK, OpenEntry("First", &entry2));
   EXPECT_NE(net::OK, CreateEntry("Something new", &entry2));
   EXPECT_NE(net::OK, DoomEntry("First"));
   EXPECT_NE(net::OK, DoomAllEntries());
   EXPECT_NE(net::OK, DoomEntriesBetween(Time(), Time::Now()));
   EXPECT_NE(net::OK, DoomEntriesSince(Time()));
   iter = CreateIterator();
   EXPECT_NE(net::OK, iter->OpenNextEntry(&entry2));
 
-  std::vector<std::pair<std::string, std::string>> stats;
+  base::StringPairs stats;
   cache_->GetStats(&stats);
   EXPECT_TRUE(stats.empty());
   cache_->OnExternalCacheHit("First");
 }
 
 TEST_F(DiskCacheBackendTest, DisabledAPI) {
   ASSERT_TRUE(CopyTestCache("bad_rankings2"));
   DisableFirstCleanup();
   InitCache();
   BackendDisabledAPI();
@@ skipping 764 matching lines @@
 // after closing.
 // NOTE: IF THIS TEST IS FLAKY THEN IT IS FAILING. See https://crbug.com/416940
 TEST_F(DiskCacheBackendTest, SimpleCacheDeleteQuickly) {
   SetSimpleCacheMode();
   for (int i = 0; i < 100; ++i) {
     InitCache();
     cache_.reset();
     EXPECT_TRUE(CleanupCacheDir());
   }
 }