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

content/browser/webui/web_ui_data_source_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/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/webui/web_ui_data_source_impl.h"
 #include "content/test/test_content_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 123 matching lines @@
   StartDataRequest("strings.js");
   result = std::string(
       reinterpret_cast<const char*>(result_data_->front()),
       result_data_->size());
   EXPECT_NE(result.find(kDummyDefaultResource), std::string::npos);
 }
 
 TEST_F(WebUIDataSourceTest, MimeType) {
   const char* html = "text/html";
   const char* js = "application/javascript";
-  EXPECT_EQ(GetMimeType(""), html);
+  EXPECT_EQ(GetMimeType(std::string()), html);
   EXPECT_EQ(GetMimeType("foo"), html);
   EXPECT_EQ(GetMimeType("foo.html"), html);
   EXPECT_EQ(GetMimeType(".js"), js);
   EXPECT_EQ(GetMimeType("foo.js"), js);
   EXPECT_EQ(GetMimeType("js"), html);
   EXPECT_EQ(GetMimeType("foojs"), html);
   EXPECT_EQ(GetMimeType("foo.jsp"), html);
 }
 
 }  // namespace content