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

Source/core/inspector/InspectorInstrumentation.cpp

Index: Source/core/inspector/InspectorInstrumentation.cpp
diff --git a/Source/core/inspector/InspectorInstrumentation.cpp b/Source/core/inspector/InspectorInstrumentation.cpp
index 4029db903331a586f9b287da8479a64df5113755..ccc9b2800731f0053f027e7a95542f28f325ab59 100644
--- a/Source/core/inspector/InspectorInstrumentation.cpp
+++ b/Source/core/inspector/InspectorInstrumentation.cpp
@@ -195,9 +195,11 @@
     return 0;
 }
 
-InstrumentingAgents* instrumentingAgentsFor(LocalFrame* frame)
-{
-    return frame ? frame->instrumentingAgents() : nullptr;
+InstrumentingAgents* instrumentingAgentsFor(Page* page)
+{
+    if (!page)
+        return 0;
+    return instrumentationForPage(page);
 }
 
 InstrumentingAgents* instrumentingAgentsFor(EventTarget* eventTarget)
@@ -217,6 +219,11 @@
     if (!workerGlobalScope)
         return 0;
     return instrumentationForWorkerGlobalScope(workerGlobalScope);
+}
+
+InstrumentingAgents* instrumentingAgentsFor(FrameHost* host)
+{
+    return instrumentationForPage(&host->page());
 }
 
 InstrumentingAgents* instrumentingAgentsForNonDocumentContext(ExecutionContext* context)
@@ -247,6 +254,12 @@
 const char CallbackName[] = "callbackName";
 };
 
+InstrumentingAgents* instrumentationForPage(Page* page)
+{
+    ASSERT(isMainThread());
+    return page->inspectorController().m_instrumentingAgents.get();
+}
+
 InstrumentingAgents* instrumentationForWorkerGlobalScope(WorkerGlobalScope* workerGlobalScope)
 {
     if (WorkerInspectorController* controller = workerGlobalScope->workerInspectorController())