Move shell service to toplevel shell namespace

services/tracing/public/cpp/tracing_impl.cc

Index: services/tracing/public/cpp/tracing_impl.cc
diff --git a/services/tracing/public/cpp/tracing_impl.cc b/services/tracing/public/cpp/tracing_impl.cc
index 349ccb5a27dec10d8b7a8020d1bbbfa9e2ee73d6..6b6f68fb64f1c9a8b4e43c536bbc8301ff539dab 100644
--- a/services/tracing/public/cpp/tracing_impl.cc
+++ b/services/tracing/public/cpp/tracing_impl.cc
@@ -41,7 +41,8 @@ TracingImpl::TracingImpl() {
 TracingImpl::~TracingImpl() {
 }
 
-void TracingImpl::Initialize(Connector* connector, const std::string& url) {
+void TracingImpl::Initialize(shell::Connector* connector,
+                             const std::string& url) {
   {
     base::AutoLock lock(g_singleton_lock.Get());
     if (g_tracing_singleton_created)
@@ -66,7 +67,7 @@ void TracingImpl::Initialize(Connector* connector, const std::string& url) {
 #endif
 }
 
-void TracingImpl::Create(Connection* connection,
+void TracingImpl::Create(shell::Connection* connection,
                          InterfaceRequest<tracing::TraceProvider> request) {
   provider_impl_.Bind(std::move(request));
 }