Convert src/net to use std::string/char* for DictionaryValue keys.

net/http/http_net_log_params.h

Index: net/http/http_net_log_params.h
diff --git a/net/http/http_net_log_params.h b/net/http/http_net_log_params.h
index 639d959546ad0351892ea322fc915f4f9d0b4d79..4b419da7ee047d9dc22c37d41bb7c8014775978c 100644
--- a/net/http/http_net_log_params.h
+++ b/net/http/http_net_log_params.h
@@ -28,7 +28,7 @@ class NetLogHttpRequestParameter : public NetLog::EventParameters {
 
   Value* ToValue() const {
     DictionaryValue* dict = new DictionaryValue();
-    dict->SetString(L"line", line_);
+    dict->SetString("line", line_);
     ListValue* headers = new ListValue();
     HttpRequestHeaders::Iterator iterator(headers_);
     while (iterator.GetNext()) {
@@ -37,7 +37,7 @@ class NetLogHttpRequestParameter : public NetLog::EventParameters {
                                        iterator.name().c_str(),
                                        iterator.value().c_str())));
     }
-    dict->Set(L"headers", headers);
+    dict->Set("headers", headers);
     return dict;
   }
 
@@ -67,7 +67,7 @@ class NetLogHttpResponseParameter : public NetLog::EventParameters {
       headers->Append(
           new StringValue(StringPrintf("%s: %s", name.c_str(), value.c_str())));
     }
-    dict->Set(L"headers", headers);
+    dict->Set("headers", headers);
     return dict;
   }