[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/schema_handler.h

Index: content/browser/devtools/protocol/schema_handler.h
diff --git a/content/browser/devtools/protocol/schema_handler.h b/content/browser/devtools/protocol/schema_handler.h
index 33991ae40ae5079c7abe738aa8d2f665d00f4d1e..c57c7f24e066ba774755dc2e9a215bba43296ea4 100644
--- a/content/browser/devtools/protocol/schema_handler.h
+++ b/content/browser/devtools/protocol/schema_handler.h
@@ -6,18 +6,19 @@
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SCHEMA_HANDLER_H_
 
 #include "base/macros.h"
+#include "content/browser/devtools/protocol/devtools_domain_handler.h"
 #include "content/browser/devtools/protocol/schema.h"
 
 namespace content {
 namespace protocol {
 
-class SchemaHandler : public Schema::Backend {
+class SchemaHandler : public DevToolsDomainHandler,
+                      public Schema::Backend {
  public:
   SchemaHandler();
   ~SchemaHandler() override;
 
-  void Wire(UberDispatcher*);
-  Response Disable() override;
+  void Wire(UberDispatcher* dispatcher) override;
 
   Response GetDomains(
       std::unique_ptr<protocol::Array<Schema::Domain>>* domains) override;