[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/memory_handler.cc

Index: content/browser/devtools/protocol/memory_handler.cc
diff --git a/content/browser/devtools/protocol/memory_handler.cc b/content/browser/devtools/protocol/memory_handler.cc
index 2a92df14e623d8c2282b08cf4dee2a7bfdd527fa..9b0852a986761585c34601739aa53e630e8eb4be 100644
--- a/content/browser/devtools/protocol/memory_handler.cc
+++ b/content/browser/devtools/protocol/memory_handler.cc
@@ -12,7 +12,9 @@
 namespace content {
 namespace protocol {
 
-MemoryHandler::MemoryHandler() {}
+MemoryHandler::MemoryHandler()
+    : DevToolsDomainHandler(Memory::Metainfo::domainName) {
+}
 
 MemoryHandler::~MemoryHandler() {}
 
@@ -20,6 +22,9 @@ void MemoryHandler::Wire(UberDispatcher* dispatcher) {
   Memory::Dispatcher::wire(dispatcher, this);
 }
 
+void MemoryHandler::SetRenderFrameHost(RenderFrameHostImpl* host) {
+}
+
 Response MemoryHandler::Disable() {
   return Response::OK();
 }