Eliminate mojo::Shell client lib class

mojo/services/tracing/public/cpp/tracing_impl.cc

Index: mojo/services/tracing/public/cpp/tracing_impl.cc
diff --git a/mojo/services/tracing/public/cpp/tracing_impl.cc b/mojo/services/tracing/public/cpp/tracing_impl.cc
index 2ac27496eca7a048684badc5def0fd6baab2c14b..e7a369c76bbd98aee359b59ea08acdb56beb02e6 100644
--- a/mojo/services/tracing/public/cpp/tracing_impl.cc
+++ b/mojo/services/tracing/public/cpp/tracing_impl.cc
@@ -10,7 +10,7 @@
 #include "base/synchronization/lock.h"
 #include "base/threading/platform_thread.h"
 #include "base/trace_event/trace_event_impl.h"
-#include "mojo/shell/public/cpp/shell.h"
+#include "mojo/shell/public/cpp/connector.h"
 
 #ifdef NDEBUG
 #include "base/command_line.h"
@@ -41,7 +41,7 @@ TracingImpl::TracingImpl() {
 TracingImpl::~TracingImpl() {
 }
 
-void TracingImpl::Initialize(Shell* shell, const std::string& url) {
+void TracingImpl::Initialize(Connector* connector, const std::string& url) {
   {
     base::AutoLock lock(g_singleton_lock.Get());
     if (g_tracing_singleton_created)
@@ -53,7 +53,7 @@ void TracingImpl::Initialize(Shell* shell, const std::string& url) {
   // up to something like CoreServices to name its own child threads.
   base::PlatformThread::SetName(url);
 
-  connection_ = shell->Connect("mojo:tracing");
+  connection_ = connector->Connect("mojo:tracing");
   connection_->AddInterface(this);
 
 #ifdef NDEBUG