Revert of html_viewer: Add DevToolsAgentImpl.

components/devtools_service/public/interfaces/devtools_service.mojom

Index: components/devtools_service/public/interfaces/devtools_service.mojom
diff --git a/components/devtools_service/public/interfaces/devtools_service.mojom b/components/devtools_service/public/interfaces/devtools_service.mojom
index 80a2ad880dce3ef246f4532818ab7e473cbfcb8c..5f7b454397848f4a89222ff8c012a854600925e1 100644
--- a/components/devtools_service/public/interfaces/devtools_service.mojom
+++ b/components/devtools_service/public/interfaces/devtools_service.mojom
@@ -30,7 +30,7 @@
   // DispatchProtocolMessage() calls. If a client doesn't want to receive
   // messages anymore, it could simply close the underlying message pipe of
   // |client|.
-  SetClient(DevToolsAgentClient client, string client_id);
+  SetClient(DevToolsAgentClient client);
 
   // Sends a command (in remote debugging protocol JSON format) to the agent.
   DispatchProtocolMessage(string message);