Remove redundant mapping of net errors to strings.

components/cronet/android/org_chromium_net_UrlRequest.cc

 // Copyright 2014 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 "components/cronet/android/org_chromium_net_UrlRequest.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/macros.h"
 #include "components/cronet/android/url_request_context_peer.h"
@@ skipping 233 matching lines @@
   }
   return REQUEST_ERROR_UNKNOWN;
 }
 
 static jstring GetErrorString(JNIEnv* env,
                               jobject object,
                               jlong urlRequestPeer) {
   URLRequestPeer* request = reinterpret_cast<URLRequestPeer*>(urlRequestPeer);
   int error_code = request->error_code();
   char buffer[200];
+  std::string error_string = net::ErrorToString(error_code);
   snprintf(buffer,
            sizeof(buffer),
            "System error: %s(%d)",
-           net::ErrorToString(error_code),
+           error_string.c_str(),
            error_code);
   return ConvertUTF8ToJavaString(env, buffer).Release();
 }
 
 static jint GetHttpStatusCode(JNIEnv* env,
                               jobject object,
                               jlong urlRequestPeer) {
   URLRequestPeer* request = reinterpret_cast<URLRequestPeer*>(urlRequestPeer);
   return request->http_status_code();
 }
@@ skipping 33 matching lines @@
   std::string name_string = base::android::ConvertJavaStringToUTF8(env, name);
   std::string value = request->GetHeader(name_string);
   if (!value.empty()) {
     return ConvertUTF8ToJavaString(env, value.c_str()).Release();
   } else {
     return NULL;
   }
 }
 
 }  // namespace cronet