Moving the DirectiveHandler to be owned by CopresenceManager.

components/copresence/public/copresence_delegate.h

Index: components/copresence/public/copresence_delegate.h
diff --git a/components/copresence/public/copresence_delegate.h b/components/copresence/public/copresence_delegate.h
index 9dd30b7285029e280984610f1b7a3f69849fe30a..64371d564d123cb6d73cba0ed46216f6fb8dc2c1 100644
--- a/components/copresence/public/copresence_delegate.h
+++ b/components/copresence/public/copresence_delegate.h
@@ -29,13 +29,14 @@ class CopresenceDelegate {
  public:
   virtual ~CopresenceDelegate() {}
 
-  // This method will be called when we have subscribed messages that need to
-  // be sent to their respective apps.
+  // This method will be called when we have subscribed messages
+  // that need to be sent to their respective apps.
   virtual void HandleMessages(
       const std::string& app_id,
       const std::string& subscription_id,
       const std::vector<Message>& message) = 0;
 
+  // Thw URLRequestContextGetter must outlive the CopresenceManager.
   virtual net::URLRequestContextGetter* GetRequestContext() const = 0;
 
   virtual const std::string GetPlatformVersionString() const = 0;
@@ -43,6 +44,7 @@ class CopresenceDelegate {
   virtual const std::string GetAPIKey(const std::string& app_id) const = 0;
   virtual const std::string GetAuthToken() const = 0;
 
+  // Thw WhispernetClient must outlive the CopresenceManager.
   virtual WhispernetClient* GetWhispernetClient() = 0;
 };