Use string for Histogram names since these are all ASCII anyway wide-characte...

net/http/http_network_transaction.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_network_transaction.h"
 
 #include "base/scoped_ptr.h"
 #include "base/compiler_specific.h"
 #include "base/string_util.h"
 #include "base/trace_event.h"
@@ skipping 875 matching lines @@
     next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
   }
 
   return OK;
 }
 
 void HttpNetworkTransaction::LogTransactionMetrics() const {
   base::TimeDelta duration = base::Time::Now() - response_.request_time;
   if (60 < duration.InMinutes())
     return;
-  UMA_HISTOGRAM_LONG_TIMES(L"Net.Transaction_Latency", duration);
+  UMA_HISTOGRAM_LONG_TIMES("Net.Transaction_Latency", duration);
   if (!duration.InMilliseconds())
     return;
-  UMA_HISTOGRAM_COUNTS(L"Net.Transaction_Bandwidth",
+  UMA_HISTOGRAM_COUNTS("Net.Transaction_Bandwidth",
       static_cast<int> (content_read_ / duration.InMilliseconds()));
 }
 
 int HttpNetworkTransaction::DidReadResponseHeaders() {
   scoped_refptr<HttpResponseHeaders> headers;
   if (has_found_status_line_start()) {
     headers = new HttpResponseHeaders(
         HttpUtil::AssembleRawHeaders(
             header_buf_.get(), header_buf_body_offset_));
   } else {
@@ skipping 456 matching lines @@
   if (target == HttpAuth::AUTH_PROXY) {
     auth_info->host = ASCIIToWide(proxy_info_.proxy_server().host_and_port());
   } else {
     DCHECK(target == HttpAuth::AUTH_SERVER);
     auth_info->host = ASCIIToWide(request_->url.host());
   }
   response_.auth_challenge = auth_info;
 }
 
 }  // namespace net