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

Source/core/inspector/InspectorDOMAgent.cpp

Index: Source/core/inspector/InspectorDOMAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMAgent.cpp b/Source/core/inspector/InspectorDOMAgent.cpp
index 1d1dbc220c76d866fbefc670c65d579d6437b5b8..ecbdd5a17e802bd49363d93138791a520bb51491 100644
--- a/Source/core/inspector/InspectorDOMAgent.cpp
+++ b/Source/core/inspector/InspectorDOMAgent.cpp
@@ -283,7 +283,7 @@
 
     m_frontend = frontend->dom();
     m_instrumentingAgents->setInspectorDOMAgent(this);
-    m_document = m_pageAgent->inspectedFrame()->document();
+    m_document = m_pageAgent->mainFrame()->document();
 }
 
 void InspectorDOMAgent::clearFrontend()
@@ -532,7 +532,7 @@
 {
     m_state->setBoolean(DOMAgentState::domAgentEnabled, true);
     m_document = nullptr;
-    setDocument(m_pageAgent->inspectedFrame()->document());
+    setDocument(m_pageAgent->mainFrame()->document());
     if (m_listener)
         m_listener->domAgentWasEnabled();
 }
@@ -1900,7 +1900,7 @@
 
 void InspectorDOMAgent::domContentLoadedEventFired(LocalFrame* frame)
 {
-    if (frame != m_pageAgent->inspectedFrame())
+    if (!frame->isMainFrame())
         return;
 
     // Re-push document once it is loaded.
@@ -1930,15 +1930,20 @@
     m_frontend->childNodeInserted(parentId, prevId, value.release());
 }
 
-void InspectorDOMAgent::didCommitLoad(LocalFrame*, DocumentLoader* loader)
-{
-    LocalFrame* inspectedFrame = m_pageAgent->inspectedFrame();
-    if (loader->frame() != inspectedFrame) {
+void InspectorDOMAgent::didCommitLoad(LocalFrame* frame, DocumentLoader* loader)
+{
+    // FIXME: If "frame" is always guarenteed to be in the same Page as loader->frame()
+    // then all we need to check here is loader->frame()->isMainFrame()
+    // and we don't need "frame" at all.
+    if (!frame->page()->mainFrame()->isLocalFrame())
+        return;
+    LocalFrame* mainFrame = frame->page()->deprecatedLocalMainFrame();
+    if (loader->frame() != mainFrame) {
         invalidateFrameOwnerElement(loader->frame());
         return;
     }
 
-    setDocument(inspectedFrame->document());
+    setDocument(mainFrame->document());
 }
 
 void InspectorDOMAgent::didInsertDOMNode(Node* node)
@@ -2129,7 +2134,9 @@
     if (!document)
         return;
 
-    if (frame != m_pageAgent->inspectedFrame())
+    Page* page = frame->page();
+    ASSERT(page);
+    if (frame != page->mainFrame())
         return;
 
     // Only update the main frame document, nested frame document updates are not required
@@ -2235,7 +2242,7 @@
         }
 
         Node* node = InspectorNodeIds::nodeForId(backendNodeId);
-        if (node && node->document().frame()->instrumentingAgents() == m_pageAgent->inspectedFrame()->instrumentingAgents())
+        if (node && node->document().page() == m_pageAgent->page())
             result->addItem(pushNodePathToFrontend(node));
         else
             result->addItem(0);