Start adding tests for LevelDBWrapper, and fix a bunch of bugs.

content/browser/dom_storage/dom_storage_context_wrapper.cc

Index: content/browser/dom_storage/dom_storage_context_wrapper.cc
diff --git a/content/browser/dom_storage/dom_storage_context_wrapper.cc b/content/browser/dom_storage/dom_storage_context_wrapper.cc
index b8059d985655666f84a8820968f72b74e401ffc6..031e605638c04e553431bcc8774355c12ce4e07c 100644
--- a/content/browser/dom_storage/dom_storage_context_wrapper.cc
+++ b/content/browser/dom_storage/dom_storage_context_wrapper.cc
@@ -125,9 +125,6 @@ class DOMStorageContextWrapper::MojoState {
                         mojom::LevelDBObserverPtr observer,
                         mojom::LevelDBWrapperRequest request);
 
-  // Maps between an origin and its prefixed LevelDB view.
-  std::map<url::Origin, std::unique_ptr<LevelDBWrapperImpl>> level_db_wrappers_;
-
   service_manager::Connector* const connector_;
   const base::FilePath subdirectory_;
 
@@ -147,6 +144,9 @@ class DOMStorageContextWrapper::MojoState {
 
   std::vector<base::Closure> on_database_opened_callbacks_;
 
+  // Maps between an origin and its prefixed LevelDB view.
+  std::map<url::Origin, std::unique_ptr<LevelDBWrapperImpl>> level_db_wrappers_;
+
   base::WeakPtrFactory<MojoState> weak_ptr_factory_;
 };