Revert of Add builders for tracing event's structural arguments

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index ed7472d638ba891a70e9ae04a6384fc70068fde8..2ef991cfdda68ffdad2f57e0dac43b9153e047b4 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -12,7 +12,6 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
-#include "base/debug/trace_event_argument.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
@@ -1154,10 +1153,10 @@
                  animate));
 }
 
-void LayerTreeHost::AsValueInto(base::debug::TracedValue* state) const {
-  state->BeginDictionary("proxy");
-  proxy_->AsValueInto(state);
-  state->EndDictionary();
+scoped_ptr<base::Value> LayerTreeHost::AsValue() const {
+  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
+  state->Set("proxy", proxy_->AsValue().release());
+  return state.PassAs<base::Value>();
 }
 
 void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {