Move interface registration to OnConnect in RPH

content/common/mojo/mojo_shell_connection_impl.cc

Index: content/common/mojo/mojo_shell_connection_impl.cc
diff --git a/content/common/mojo/mojo_shell_connection_impl.cc b/content/common/mojo/mojo_shell_connection_impl.cc
index ee7ff9767d7ee411493ea079b65e2bca9997e386..06419ba76e3fbf79db6b572e302f457a2a726c28 100644
--- a/content/common/mojo/mojo_shell_connection_impl.cc
+++ b/content/common/mojo/mojo_shell_connection_impl.cc
@@ -86,7 +86,7 @@ class MojoShellConnectionImpl::IOThreadContext
 
   // Safe to call any time before Start() is called.
   void AddConnectionFilter(std::unique_ptr<ConnectionFilter> filter) {
-    DCHECK(!started_);
+    //DCHECK(!started_);
     connection_filters_.emplace_back(std::move(filter));
   }
 
@@ -390,10 +390,13 @@ void MojoShellConnectionImpl::SetupInterfaceRequestProxies(
       base::Bind(&MojoShellConnectionImpl::GetInterface,
                  weak_factory_.GetWeakPtr(), registry));
 
-  // Forward all remote interface requests on |provider| to our IO-thread
-  // context. This will ensure they're forwarded to the provider on the
-  // incoming browser connection.
-  provider->Forward(base::Bind(&IOThreadContext::GetRemoteInterface, context_));
+  if (provider) {
+    // Forward all remote interface requests on |provider| to our IO-thread
+    // context. This will ensure they're forwarded to the provider on the
+    // incoming browser connection.
+    provider->Forward(base::Bind(&IOThreadContext::GetRemoteInterface,
+                                 context_));
+  }
 }
 
 void MojoShellConnectionImpl::AddConnectionFilter(