[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..bdc14bc821fb1b22f0b65b10c3c439db35da0769 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() {}
 
@@ -20,10 +22,6 @@ void MemoryHandler::Wire(UberDispatcher* dispatcher) {
   Memory::Dispatcher::wire(dispatcher, this);
 }
 
-Response MemoryHandler::Disable() {
-  return Response::OK();
-}
-
 Response MemoryHandler::SetPressureNotificationsSuppressed(
     bool suppressed) {
   if (base::FeatureList::IsEnabled(features::kMemoryCoordinator)) {