Raise the chrome.storage.sync per-item quota to 8K.

chrome/browser/extensions/api/storage/settings_sync_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/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1322 matching lines @@
       sync_processor_->GetOnlyChange("good", "foo").change_type());
   EXPECT_EQ(2u, sync_processor_->changes().size());
 }
 
 TEST_F(ExtensionSettingsSyncTest,
        LargeOutgoingChangeRejectedButIncomingAccepted) {
   syncer::ModelType model_type = syncer::APP_SETTINGS;
   Manifest::Type type = Manifest::TYPE_LEGACY_PACKAGED_APP;
 
   // This value should be larger than the limit in sync_storage_backend.cc.
-  std::string string_5k;
-  for (size_t i = 0; i < 5000; ++i) {
-    string_5k.append("a");
+  std::string string_10k;
+  for (size_t i = 0; i < 10000; ++i) {
+    string_10k.append("a");
   }
-  base::StringValue large_value(string_5k);
+  base::StringValue large_value(string_10k);
 
   GetSyncableService(model_type)->MergeDataAndStartSyncing(
       model_type,
       syncer::SyncDataList(),
       sync_processor_wrapper_.PassAs<syncer::SyncChangeProcessor>(),
       scoped_ptr<syncer::SyncErrorFactory>(new syncer::SyncErrorFactoryMock()));
 
   // Large local change rejected and doesn't get sent out.
   ValueStore* storage1 = AddExtensionAndGetStorage("s1", type);
   EXPECT_TRUE(storage1->Set(DEFAULTS, "large_value", large_value)->HasError());
@@ skipping 59 matching lines @@
     ASSERT_EQ(1u, sync_processor_->changes().size());
     SettingSyncData sync_data = sync_processor_->changes()[0];
     EXPECT_EQ(syncer::SyncChange::ACTION_ADD, sync_data.change_type());
     EXPECT_EQ("ext", sync_data.extension_id());
     EXPECT_EQ("key.with.spot", sync_data.key());
     EXPECT_TRUE(sync_data.value().Equals(string_value.get()));
   }
 }
 
 }  // namespace extensions