Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/clipboard/clipboard_application_delegate.cc

Index: components/clipboard/clipboard_application_delegate.cc
diff --git a/components/clipboard/clipboard_application_delegate.cc b/components/clipboard/clipboard_application_delegate.cc
index a7e91ba6879de39c572eeb0e8b84912a20cbe321..9f3cde569324125b4e0dbec2665fa7f3e2d1ab45 100644
--- a/components/clipboard/clipboard_application_delegate.cc
+++ b/components/clipboard/clipboard_application_delegate.cc
@@ -15,8 +15,10 @@ ClipboardApplicationDelegate::ClipboardApplicationDelegate() {}
 
 ClipboardApplicationDelegate::~ClipboardApplicationDelegate() {}
 
-void ClipboardApplicationDelegate::Initialize(mojo::ApplicationImpl* app) {
-  tracing_.Initialize(app);
+void ClipboardApplicationDelegate::Initialize(mojo::Shell* shell,
+                                              const std::string& url,
+                                              uint32_t id) {
+  tracing_.Initialize(shell, url);
 }
 
 bool ClipboardApplicationDelegate::AcceptConnection(