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

Source/core/inspector/InspectorInstrumentation.h

Index: Source/core/inspector/InspectorInstrumentation.h
diff --git a/Source/core/inspector/InspectorInstrumentation.h b/Source/core/inspector/InspectorInstrumentation.h
index c0362806872208a3ece8be2c366cd087e5b36dc1..724a727857863e1f36f6cdf80c89773b2504a00e 100644
--- a/Source/core/inspector/InspectorInstrumentation.h
+++ b/Source/core/inspector/InspectorInstrumentation.h
@@ -54,6 +54,7 @@
 class Document;
 class EventTarget;
 class ExecutionContext;
+class FrameHost;
 class InspectorTimelineAgent;
 class InstrumentingAgents;
 class ThreadableLoaderClient;
@@ -100,6 +101,7 @@
 InspectorTimelineAgent* retrieveTimelineAgent(const InspectorInstrumentationCookie&);
 
 // Called from generated instrumentation code.
+InstrumentingAgents* instrumentingAgentsFor(Page*);
 InstrumentingAgents* instrumentingAgentsFor(LocalFrame*);
 InstrumentingAgents* instrumentingAgentsFor(EventTarget*);
 InstrumentingAgents* instrumentingAgentsFor(ExecutionContext*);
@@ -108,6 +110,7 @@
 InstrumentingAgents* instrumentingAgentsFor(RenderObject*);
 InstrumentingAgents* instrumentingAgentsFor(Node*);
 InstrumentingAgents* instrumentingAgentsFor(WorkerGlobalScope*);
+InstrumentingAgents* instrumentingAgentsFor(FrameHost*);
 
 // Helper for the one above.
 InstrumentingAgents* instrumentingAgentsForNonDocumentContext(ExecutionContext*);
@@ -142,12 +145,17 @@
     return context->isDocument() ? instrumentingAgentsFor(*toDocument(context)) : instrumentingAgentsForNonDocumentContext(context);
 }
 
+inline InstrumentingAgents* instrumentingAgentsFor(LocalFrame* frame)
+{
+    return frame ? instrumentingAgentsFor(frame->page()) : 0;
+}
+
 inline InstrumentingAgents* instrumentingAgentsFor(Document& document)
 {
-    LocalFrame* frame = document.frame();
-    if (!frame && document.templateDocumentHost())
-        frame = document.templateDocumentHost()->frame();
-    return instrumentingAgentsFor(frame);
+    Page* page = document.page();
+    if (!page && document.templateDocumentHost())
+        page = document.templateDocumentHost()->page();
+    return instrumentingAgentsFor(page);
 }
 
 inline InstrumentingAgents* instrumentingAgentsFor(Document* document)
@@ -172,6 +180,8 @@
 
 } // namespace InspectorInstrumentation
 
+InstrumentingAgents* instrumentationForPage(Page*);
+
 InstrumentingAgents* instrumentationForWorkerGlobalScope(WorkerGlobalScope*);
 
 } // namespace blink