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

Source/core/inspector/InspectorTracingAgent.cpp

Index: Source/core/inspector/InspectorTracingAgent.cpp
diff --git a/Source/core/inspector/InspectorTracingAgent.cpp b/Source/core/inspector/InspectorTracingAgent.cpp
index c1f77359dcaa80d9efe8ec3d7eb07bd81da0bfd4..b6ae30ebe2e24764429e7d6bef5651adecf2dbf7 100644
--- a/Source/core/inspector/InspectorTracingAgent.cpp
+++ b/Source/core/inspector/InspectorTracingAgent.cpp
@@ -10,10 +10,10 @@
 
 #include "core/inspector/IdentifiersFactory.h"
 #include "core/inspector/InspectorClient.h"
-#include "core/inspector/InspectorPageAgent.h"
 #include "core/inspector/InspectorState.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/inspector/InspectorWorkerAgent.h"
+#include "core/page/Page.h"
 #include "platform/TraceEvent.h"
 
 namespace blink {
@@ -26,20 +26,20 @@
 const char devtoolsMetadataEventCategory[] = TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
 }
 
-InspectorTracingAgent::InspectorTracingAgent(InspectorClient* client, InspectorWorkerAgent* workerAgent, InspectorPageAgent* pageAgent)
+InspectorTracingAgent::InspectorTracingAgent(InspectorClient* client, InspectorWorkerAgent* workerAgent, Page* page)
     : InspectorBaseAgent<InspectorTracingAgent>("Tracing")
     , m_layerTreeId(0)
     , m_client(client)
     , m_frontend(0)
     , m_workerAgent(workerAgent)
-    , m_pageAgent(pageAgent)
+    , m_page(page)
 {
 }
 
 void InspectorTracingAgent::trace(Visitor* visitor)
 {
     visitor->trace(m_workerAgent);
-    visitor->trace(m_pageAgent);
+    visitor->trace(m_page);
     InspectorBaseAgent<InspectorTracingAgent>::trace(visitor);
 }
 
@@ -71,7 +71,7 @@
 
 void InspectorTracingAgent::emitMetadataEvents()
 {
-    TRACE_EVENT_INSTANT1(devtoolsMetadataEventCategory, "TracingStartedInPage", "data", InspectorTracingStartedInFrame::data(sessionId(), m_pageAgent->inspectedFrame()));
+    TRACE_EVENT_INSTANT1(devtoolsMetadataEventCategory, "TracingStartedInPage", "data", InspectorTracingStartedInPage::data(sessionId(), m_page));
     if (m_layerTreeId)
         setLayerTreeId(m_layerTreeId);
     m_workerAgent->setTracingSessionId(sessionId());