Delete some unused code found by -Wunused-function

content/renderer/pepper/pepper_url_request_unittest.cc

 // Copyright (c) 2012 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 "base/compiler_specific.h"
 #include "content/public/test/render_view_test.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/url_request_info_resource.h"
 #include "ppapi/shared_impl/test_globals.h"
 #include "ppapi/shared_impl/url_request_info_data.h"
@@ skipping 24 matching lines @@
 
 bool IsExpected(const WebCString& web_string, const char* expected) {
   const char* result = web_string.data();
   return strcmp(result, expected) == 0;
 }
 
 bool IsExpected(const WebString& web_string, const char* expected) {
   return IsExpected(web_string.utf8(), expected);
 }
 
-bool IsNullOrEmpty(const WebString& web_string) {
-  return web_string.isNull() || web_string.isEmpty();
-}
-
 // The base class destructor is protected, so derive.
 class TestWebFrameClient : public WebFrameClient {
 };
 
 }  // namespace
 
 using ppapi::proxy::URLRequestInfoResource;
 using ppapi::URLRequestInfoData;
 
 // TODO(brettw) move to content namespace when url_request_info_util.h is moved
@@ skipping 196 matching lines @@
   EXPECT_TRUE(IsExpected(
       GetHeaderValue("foo"), "bar"));
   EXPECT_TRUE(IsExpected(
       GetHeaderValue("bar"), "baz"));
 }
 
 // TODO(bbudge) Unit tests for AppendDataToBody, AppendFileToBody.
 
 }  // namespace ppapi
 }  // namespace webkit