Revert of Update DevTools Tracing.Start to accept trace config as a parameter

content/browser/devtools/protocol/tracing_handler.cc

Index: content/browser/devtools/protocol/tracing_handler.cc
diff --git a/content/browser/devtools/protocol/tracing_handler.cc b/content/browser/devtools/protocol/tracing_handler.cc
index e7de4c753ce05c7a1166eaa8a1889d8db75ad7fa..d85695731cd3410809e28c56421b338f7b71dd0d 100644
--- a/content/browser/devtools/protocol/tracing_handler.cc
+++ b/content/browser/devtools/protocol/tracing_handler.cc
@@ -8,7 +8,6 @@
 
 #include "base/bind.h"
 #include "base/format_macros.h"
-#include "base/json/json_writer.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
@@ -31,46 +30,6 @@
 
 const double kMinimumReportingInterval = 250.0;
 
-const char kRecordModeParam[] = "record_mode";
-
-// Convert from camel case to separator + lowercase.
-std::string ConvertFromCamelCase(const std::string& in_str, char separator) {
-  std::string out_str;
-  out_str.reserve(in_str.size());
-  for (const char& c : in_str) {
-    if (isupper(c)) {
-      out_str.push_back(separator);
-      out_str.push_back(tolower(c));
-    } else {
-      out_str.push_back(c);
-    }
-  }
-  return out_str;
-}
-
-scoped_ptr<base::Value> ConvertDictKeyStyle(const base::Value& value) {
-  const base::DictionaryValue* dict = nullptr;
-  if (value.GetAsDictionary(&dict)) {
-    scoped_ptr<base::DictionaryValue> out_dict(new base::DictionaryValue());
-    for (base::DictionaryValue::Iterator it(*dict); !it.IsAtEnd();
-         it.Advance()) {
-      out_dict->Set(ConvertFromCamelCase(it.key(), '_'),
-                    ConvertDictKeyStyle(it.value()));
-    }
-    return std::move(out_dict);
-  }
-
-  const base::ListValue* list = nullptr;
-  if (value.GetAsList(&list)) {
-    scoped_ptr<base::ListValue> out_list(new base::ListValue());
-    for (const auto& value : *list)
-      out_list->Append(ConvertDictKeyStyle(*value));
-    return std::move(out_list);
-  }
-
-  return value.CreateDeepCopy();
-}
-
 class DevToolsTraceSinkProxy : public TracingController::TraceDataSink {
  public:
   explicit DevToolsTraceSinkProxy(base::WeakPtr<TracingHandler> handler)
@@ -171,36 +130,22 @@
       TracingCompleteParams::Create()->set_stream(stream_handle));
 }
 
-Response TracingHandler::Start(
-    DevToolsCommandId command_id,
-    const std::string* categories,
-    const std::string* options,
-    const double* buffer_usage_reporting_interval,
-    const std::string* transfer_mode,
-    const scoped_ptr<base::DictionaryValue>& config) {
+Response TracingHandler::Start(DevToolsCommandId command_id,
+                               const std::string* categories,
+                               const std::string* options,
+                               const double* buffer_usage_reporting_interval,
+                               const std::string* transfer_mode) {
   if (IsTracing())
     return Response::InternalError("Tracing is already started");
-
-  if (config && (categories || options)) {
-    return Response::InternalError(
-        "Either trace config (preferred), or categories+options should be "
-        "specified, but not both.");
-  }
 
   did_initiate_recording_ = true;
   return_as_stream_ =
       transfer_mode && *transfer_mode == start::kTransferModeReturnAsStream;
+  base::trace_event::TraceConfig trace_config(
+      categories ? *categories : std::string(),
+      options ? *options : std::string());
   if (buffer_usage_reporting_interval)
     SetupTimer(*buffer_usage_reporting_interval);
-
-  base::trace_event::TraceConfig trace_config;
-  if (config) {
-    trace_config = GetTraceConfigFromDevToolsConfig(*config);
-  } else if (categories || options) {
-    trace_config = base::trace_event::TraceConfig(
-        categories ? *categories : std::string(),
-        options ? *options : std::string());
-  }
 
   // If inspected target is a render process Tracing.start will be handled by
   // tracing agent in the renderer.
@@ -336,21 +281,6 @@
       TracingController::GetInstance()->IsTracing();
 }
 
-// static
-base::trace_event::TraceConfig TracingHandler::GetTraceConfigFromDevToolsConfig(
-    const base::DictionaryValue& devtools_config) {
-  scoped_ptr<base::Value> value = ConvertDictKeyStyle(devtools_config);
-  DCHECK(value && value->IsType(base::Value::TYPE_DICTIONARY));
-  scoped_ptr<base::DictionaryValue> tracing_dict(
-      static_cast<base::DictionaryValue*>(value.release()));
-
-  std::string mode;
-  if (tracing_dict->GetString(kRecordModeParam, &mode))
-    tracing_dict->SetString(kRecordModeParam, ConvertFromCamelCase(mode, '-'));
-
-  return base::trace_event::TraceConfig(*tracing_dict);
-}
-
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content