Rewrite std::string("") to std::string(), Linux edition.

chrome/test/gpu/gpu_pixel_browsertest.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/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
@@ skipping 127 matching lines @@
         ref_img_dir_ = test_data_dir_.AppendASCII("llvmpipe_reference");
         break;
       default:
         break;
     }
 
     test_name_ = testing::UnitTest::GetInstance()->current_test_info()->name();
     const char* test_status_prefixes[] = {"DISABLED_", "FLAKY_", "FAILS_"};
     for (size_t i = 0; i < arraysize(test_status_prefixes); ++i) {
       ReplaceFirstSubstringAfterOffset(
-          &test_name_, 0, test_status_prefixes[i], "");
+          &test_name_, 0, test_status_prefixes[i], std::string());
     }
 
     ui::DisableTestCompositor();
   }
 
   // If the existing ref image was saved from an revision older than the
   // ref_img_update_revision, refresh the ref image.
   void RunPixelTest(const gfx::Size& tab_container_size,
                     const base::FilePath& url,
                     int64 ref_img_update_revision,
@@ skipping 381 matching lines @@
     {160, 100, 0, 0, 0}
   };
   const size_t ref_pixel_count = sizeof(ref_pixels) / sizeof(ReferencePixel);
 
   gfx::Size container_size(400, 300);
   base::FilePath url =
       test_data_dir().AppendASCII("pixel_canvas2d.html");
   RunPixelTest(container_size, url, ref_img_revision_update,
                ref_pixels, ref_pixel_count);
 }