JSONWriter cleanup: integrate pretty print into write options.

ipc/ipc_message_utils.cc

Index: ipc/ipc_message_utils.cc
diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
index 72437a941fcd111e81986628e95aefd89fb6327e..8f27c52c3f0c05220976504028952672362dcd66 100644
--- a/ipc/ipc_message_utils.cc
+++ b/ipc/ipc_message_utils.cc
@@ -321,7 +321,7 @@ bool ParamTraits<DictionaryValue>::Read(
 
 void ParamTraits<DictionaryValue>::Log(const param_type& p, std::string* l) {
   std::string json;
-  base::JSONWriter::Write(&p, false, &json);
+  base::JSONWriter::Write(&p, &json);
   l->append(json);
 }
 
@@ -340,7 +340,7 @@ bool ParamTraits<ListValue>::Read(
 
 void ParamTraits<ListValue>::Log(const param_type& p, std::string* l) {
   std::string json;
-  base::JSONWriter::Write(&p, false, &json);
+  base::JSONWriter::Write(&p, &json);
   l->append(json);
 }