Revert of Add builders for tracing event's structural arguments

cc/resources/image_copy_raster_worker_pool.h

Index: cc/resources/image_copy_raster_worker_pool.h
diff --git a/cc/resources/image_copy_raster_worker_pool.h b/cc/resources/image_copy_raster_worker_pool.h
index 62cf3d064a6c90bd83acbdca52e80b60fd77049c..8f9d6783a69fbde8a7fed3d8be8c1b1b9d859097 100644
--- a/cc/resources/image_copy_raster_worker_pool.h
+++ b/cc/resources/image_copy_raster_worker_pool.h
@@ -12,13 +12,6 @@
 #include "cc/output/context_provider.h"
 #include "cc/resources/raster_worker_pool.h"
 #include "cc/resources/rasterizer.h"
-
-namespace base {
-namespace debug {
-class ConvertableToTraceFormat;
-class TracedValue;
-}
-}
 
 namespace cc {
 class ResourcePool;
@@ -84,8 +77,8 @@
   void OnRasterFinished();
   void OnRasterRequiredForActivationFinished();
   void FlushCopies();
-  scoped_refptr<base::debug::ConvertableToTraceFormat> StateAsValue() const;
-  void StagingStateAsValueInto(base::debug::TracedValue* staging_state) const;
+  scoped_ptr<base::Value> StateAsValue() const;
+  scoped_ptr<base::Value> StagingStateAsValue() const;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   TaskGraphRunner* task_graph_runner_;