Revert of Track frame context URL using first script heuristic

third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
index 3e085f1dad921f58b49bdf0dda7b619061c1993c..ad4732b0535a11de6d56e0d585d9b953eb97cfea 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.cpp
@@ -4,39 +4,22 @@
 
 #include "core/inspector/InspectorWebPerfAgent.h"
 
-#include "core/dom/Document.h"
-#include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalFrame.h"
-#include "core/frame/Location.h"
 #include "core/inspector/InspectedFrames.h"
-#include "public/platform/Platform.h"
 
 namespace blink {
 
 InspectorWebPerfAgent::InspectorWebPerfAgent(InspectedFrames* inspectedFrames)
     : m_inspectedFrames(inspectedFrames)
 {
-    Platform::current()->currentThread()->addTaskTimeObserver(this);
-    Platform::current()->currentThread()->addTaskObserver(this);
 }
 
 InspectorWebPerfAgent::~InspectorWebPerfAgent()
 {
-    Platform::current()->currentThread()->removeTaskTimeObserver(this);
-    Platform::current()->currentThread()->removeTaskObserver(this);
 }
 
 void InspectorWebPerfAgent::willExecuteScript(ExecutionContext* context)
 {
-    // Heuristic for minimal frame context attribution: note the Location URL
-    // for each script execution. When a long task is encountered,
-    // if there is only one Location URL involved, then report it.
-    // Otherwise don't report Location URL.
-    // NOTE: This heuristic is imperfect and will be improved in V2 API.
-    // In V2, timing of script execution along with style & layout updates will be
-    // accounted for detailed and more accurate attribution.
-    if (context->isDocument())
-        m_frameContextLocations.add(toDocument(context)->location());
 }
 
 void InspectorWebPerfAgent::didExecuteScript()
@@ -45,9 +28,6 @@
 
 void InspectorWebPerfAgent::willProcessTask()
 {
-    // Reset m_frameContextLocations. We don't clear this in didProcessTask
-    // as it is needed in ReportTaskTime which occurs after didProcessTask.
-    m_frameContextLocations.clear();
 }
 
 void InspectorWebPerfAgent::didProcessTask()
@@ -61,7 +41,6 @@
 DEFINE_TRACE(InspectorWebPerfAgent)
 {
     visitor->trace(m_inspectedFrames);
-    visitor->trace(m_frameContextLocations);
 }
 
 } // namespace blink