Revert of Let FrameView track object paint invalidations

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 8c25729a8bc850f2430012ae84c6c13e2d0cce6c..0b905f9a7de1aa1979980029b5f49d369558d4f8 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -69,7 +69,6 @@
 #include "core/paint/TransformRecorder.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "platform/DragImage.h"
-#include "platform/JSONValues.h"
 #include "platform/PluginScriptForbiddenScope.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
@@ -739,18 +738,7 @@
     if (contentLayoutItem().isNull())
         return String();
 
-    RefPtr<JSONObject> layerTree = contentLayoutItem().compositor()->layerTreeAsJSON(static_cast<LayerTreeFlags>(flags));
-
-    if (flags & LayerTreeIncludesPaintInvalidations) {
-        RefPtr<JSONArray> objectPaintInvalidations = m_view->trackedObjectPaintInvalidationsAsJSON();
-        if (objectPaintInvalidations) {
-            if (!layerTree)
-                layerTree = JSONObject::create();
-            layerTree->setArray("objectPaintInvalidations", objectPaintInvalidations);
-        }
-    }
-
-    return layerTree ? layerTree->toPrettyJSONString() : String();
+    return contentLayoutItem().compositor()->layerTreeAsText(static_cast<LayerTreeFlags>(flags));
 }
 
 bool LocalFrame::shouldThrottleRendering() const