Fix occasional crash in remote commands code

components/policy/core/common/remote_commands/remote_commands_service.cc

Index: components/policy/core/common/remote_commands/remote_commands_service.cc
diff --git a/components/policy/core/common/remote_commands/remote_commands_service.cc b/components/policy/core/common/remote_commands/remote_commands_service.cc
index d7b53bc693ccd0781e1be23d035ede2b0f17ec5e..4541f655dd2535ed2e00605a4d5cc834eb34b559 100644
--- a/components/policy/core/common/remote_commands/remote_commands_service.cc
+++ b/components/policy/core/common/remote_commands/remote_commands_service.cc
@@ -22,6 +22,7 @@ RemoteCommandsService::RemoteCommandsService(
     scoped_ptr<RemoteCommandsFactory> factory,
     CloudPolicyClient* client)
     : factory_(factory.Pass()), client_(client), weak_factory_(this) {
+  DCHECK(client_);
   queue_.AddObserver(this);
 }
 
@@ -30,7 +31,7 @@ RemoteCommandsService::~RemoteCommandsService() {
 }
 
 bool RemoteCommandsService::FetchRemoteCommands() {
-  if (!client_ || !client_->is_registered())
+  if (!client_->is_registered())
     return false;
 
   if (command_fetch_in_progress_) {