Move storage quota unit tests and test doubles next to the files they cover.

storage/browser/test/mock_quota_manager_unittest.cc

Index: storage/browser/test/mock_quota_manager_unittest.cc
diff --git a/content/browser/quota/mock_quota_manager_unittest.cc b/storage/browser/test/mock_quota_manager_unittest.cc
similarity index 98%
rename from content/browser/quota/mock_quota_manager_unittest.cc
rename to storage/browser/test/mock_quota_manager_unittest.cc
index 0899b80a2acc39b96460848f2234c83ace4406c5..6ebfbf1eb84a7e2f3a5174badb8bf5ea71fda73e 100644
--- a/content/browser/quota/mock_quota_manager_unittest.cc
+++ b/storage/browser/test/mock_quota_manager_unittest.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 "content/browser/quota/mock_quota_manager.h"
+#include "storage/browser/test/mock_quota_manager.h"
 
 #include <memory>
 #include <set>
@@ -14,8 +14,8 @@
 #include "base/run_loop.h"
 #include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
-#include "content/public/test/mock_storage_client.h"
 #include "storage/browser/test/mock_special_storage_policy.h"
+#include "storage/browser/test/mock_storage_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using storage::kQuotaStatusOk;