Quota: Remove bare new operator usage.

Change-Id: I07613815b937259cac8a4ffe9128740a3877a0aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2496020
Commit-Queue: Victor Costan <pwnall@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820447}

storage/browser/quota/usage_tracker_unittest.cc

@@ -10,6 +10,7 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/macros.h"
+#include "base/memory/scoped_refptr.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/task_environment.h"
@@ -117,7 +118,7 @@ class UsageTrackerTestQuotaClient : public QuotaClient {
 class UsageTrackerTest : public testing::Test {
  public:
   UsageTrackerTest()
-      : storage_policy_(new MockSpecialStoragePolicy()),
+      : storage_policy_(base::MakeRefCounted<MockSpecialStoragePolicy>()),
         quota_client_(base::MakeRefCounted<UsageTrackerTestQuotaClient>()),
         usage_tracker_(GetQuotaClientMap(),
                        StorageType::kTemporary,