DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/core/inspector/PageRuntimeAgent.h

Index: Source/core/inspector/PageRuntimeAgent.h
diff --git a/Source/core/inspector/PageRuntimeAgent.h b/Source/core/inspector/PageRuntimeAgent.h
index 4f4a2ea8c884c744ec421cdb81bcc3645db6998d..b02d0d4d0ffb6fadecae52668ccd8b67496aee6e 100644
--- a/Source/core/inspector/PageRuntimeAgent.h
+++ b/Source/core/inspector/PageRuntimeAgent.h
@@ -39,14 +39,13 @@ namespace blink {
 
 class InspectorClient;
 class InspectorPageAgent;
-class Page;
 class SecurityOrigin;
 
 class PageRuntimeAgent final : public InspectorRuntimeAgent {
 public:
-    static PassOwnPtrWillBeRawPtr<PageRuntimeAgent> create(InjectedScriptManager* injectedScriptManager, InspectorClient* client, ScriptDebugServer* scriptDebugServer, Page* page, InspectorPageAgent* pageAgent)
+    static PassOwnPtrWillBeRawPtr<PageRuntimeAgent> create(InjectedScriptManager* injectedScriptManager, InspectorClient* client, ScriptDebugServer* scriptDebugServer, InspectorPageAgent* pageAgent)
     {
-        return adoptPtrWillBeNoop(new PageRuntimeAgent(injectedScriptManager, client, scriptDebugServer, page, pageAgent));
+        return adoptPtrWillBeNoop(new PageRuntimeAgent(injectedScriptManager, client, scriptDebugServer, pageAgent));
     }
     virtual ~PageRuntimeAgent();
     virtual void trace(Visitor*) override;
@@ -59,7 +58,7 @@ public:
     void willReleaseScriptContext(LocalFrame*, ScriptState*);
 
 private:
-    PageRuntimeAgent(InjectedScriptManager*, InspectorClient*, ScriptDebugServer*, Page*, InspectorPageAgent*);
+    PageRuntimeAgent(InjectedScriptManager*, InspectorClient*, ScriptDebugServer*, InspectorPageAgent*);
 
     virtual InjectedScript injectedScriptForEval(ErrorString*, const int* executionContextId) override;
     virtual void muteConsole() override;
@@ -67,7 +66,6 @@ private:
     void reportExecutionContextCreation();
 
     InspectorClient* m_client;
-    RawPtrWillBeMember<Page> m_inspectedPage;
     RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     bool m_mainWorldContextCreated;
     int m_debuggerId;