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

Source/core/inspector/InspectorInstrumentationCustomInl.h

Index: Source/core/inspector/InspectorInstrumentationCustomInl.h
diff --git a/Source/core/inspector/InspectorInstrumentationCustomInl.h b/Source/core/inspector/InspectorInstrumentationCustomInl.h
index 943be80aea8d23a7656abdb9ec7250bfe0b489eb..c81c1f5d8de5be8775b35b36477b0a0cd89e054e 100644
--- a/Source/core/inspector/InspectorInstrumentationCustomInl.h
+++ b/Source/core/inspector/InspectorInstrumentationCustomInl.h
@@ -54,10 +54,10 @@
     return false;
 }
 
-inline bool collectingHTMLParseErrors(Document* document)
+inline bool collectingHTMLParseErrors(Page* page)
 {
     FAST_RETURN_IF_NO_FRONTENDS(false);
-    if (InstrumentingAgents* instrumentingAgents = instrumentingAgentsFor(document))
+    if (InstrumentingAgents* instrumentingAgents = instrumentingAgentsFor(page))
         return collectingHTMLParseErrorsImpl(instrumentingAgents);
     return false;
 }