Move storage tests from content/common next to the files they cover.

storage/BUILD.gn

Index: storage/BUILD.gn
diff --git a/storage/BUILD.gn b/storage/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d6208ef440cc79cd04c3e5895d6183220da1bda9
--- /dev/null
+++ b/storage/BUILD.gn
@@ -0,0 +1,11 @@
+# Copyright 2014 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.
+import("//testing/test.gni")
+
+test("storage_unittests") {
+  deps = [
+    "//storage/browser:unittests",
+    "//storage/common:unittests",
+  ]
+}