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

chrome/browser/history/thumbnail_database_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 <algorithm>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 396 matching lines @@
 
   EXPECT_TRUE(db.UpgradeToVersion6());
 
   statement.Assign(db.db_.GetCachedStatement(SQL_FROM_HERE,
       "SELECT id, url, icon_type, sizes FROM favicons"));
   EXPECT_TRUE(statement.Step());
   EXPECT_EQ(favicon_id, statement.ColumnInt(0));
   EXPECT_EQ(url, GURL(statement.ColumnString(1)));
   EXPECT_EQ(TOUCH_ICON, statement.ColumnInt(2));
   // Any previous data in sizes should be cleared.
-  EXPECT_EQ(std::string(""), statement.ColumnString(3));
+  EXPECT_EQ(std::string(), statement.ColumnString(3));
 
   statement.Assign(db.db_.GetCachedStatement(SQL_FROM_HERE,
       "SELECT icon_id, last_updated, image_data, width, height "
       "FROM favicon_bitmaps"));
   EXPECT_TRUE(statement.Step());
   EXPECT_EQ(favicon_id, statement.ColumnInt(0));
   EXPECT_EQ(last_updated, statement.ColumnInt64(1));
   EXPECT_EQ(static_cast<int>(bitmap_data->size()),
             statement.ColumnByteLength(2));
   EXPECT_EQ(0, statement.ColumnInt(3));
@@ skipping 419 matching lines @@
       &sizes_missing_height);
   EXPECT_EQ(0u, sizes_missing_height.size());
 
   FaviconSizes sizes_non_int;
   ThumbnailDatabase::DatabaseStringToFaviconSizes("0 0 a 10",
       &sizes_non_int);
   EXPECT_EQ(0u, sizes_non_int.size());
 
   // Valid input.
   FaviconSizes sizes_empty;
-  ThumbnailDatabase::DatabaseStringToFaviconSizes("", &sizes_empty);
+  ThumbnailDatabase::DatabaseStringToFaviconSizes(std::string(), &sizes_empty);
   EXPECT_EQ(0u, sizes_empty.size());
 
   FaviconSizes sizes_valid;
   ThumbnailDatabase::DatabaseStringToFaviconSizes("10 15 20 25", &sizes_valid);
   EXPECT_EQ(2u, sizes_valid.size());
   if (sizes_valid[0] == gfx::Size(10, 15)) {
     EXPECT_EQ(sizes_valid[1], gfx::Size(20, 25));
   } else {
     EXPECT_EQ(sizes_valid[0], gfx::Size(20, 25));
     EXPECT_EQ(sizes_valid[1], gfx::Size(10, 15));
   }
 
   std::string sizes_as_string;
   ThumbnailDatabase::FaviconSizesToDatabaseString(sizes_valid,
                                                   &sizes_as_string);
   EXPECT_TRUE(sizes_as_string == "10 15 20 25" ||
               sizes_as_string == "20 25 10 15");
 }
 
 }  // namespace history