Eliminate mojo::Shell client lib class

components/leveldb/leveldb_app.cc

Index: components/leveldb/leveldb_app.cc
diff --git a/components/leveldb/leveldb_app.cc b/components/leveldb/leveldb_app.cc
index 01fd2ff4f0e06c0bf29bc8738be9926cc31e9e83..952d4f38444632a1ee5b1167a305b235802e2526 100644
--- a/components/leveldb/leveldb_app.cc
+++ b/components/leveldb/leveldb_app.cc
@@ -13,11 +13,11 @@ LevelDBApp::LevelDBApp() {}
 
 LevelDBApp::~LevelDBApp() {}
 
-void LevelDBApp::Initialize(mojo::Shell* shell,
+void LevelDBApp::Initialize(mojo::Connector* connector,
                             const std::string& url,
                             uint32_t id,
                             uint32_t user_id) {
-  tracing_.Initialize(shell, url);
+  tracing_.Initialize(connector, url);
   service_.reset(new LevelDBServiceImpl);
 }