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

chrome/browser/io_thread.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 "chrome/browser/io_thread.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 673 matching lines @@
   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 
   std::vector<std::string> spdy_options;
   base::SplitString(mode, ',', &spdy_options);
 
   for (std::vector<std::string>::iterator it = spdy_options.begin();
        it != spdy_options.end(); ++it) {
     const std::string& element = *it;
     std::vector<std::string> name_value;
     base::SplitString(element, '=', &name_value);
-    const std::string& option = name_value.size() > 0 ? name_value[0] : "";
-    const std::string value = name_value.size() > 1 ? name_value[1] : "";
+    const std::string& option =
+        name_value.size() > 0 ? name_value[0] : std::string();
+    const std::string value =
+        name_value.size() > 1 ? name_value[1] : std::string();
 
     if (option == kOff) {
       net::HttpStreamFactory::set_spdy_enabled(false);
     } else if (option == kDisableSSL) {
       globals_->spdy_default_protocol.set(net::kProtoSPDY2);
       net::HttpStreamFactory::set_force_spdy_over_ssl(false);
       net::HttpStreamFactory::set_force_spdy_always(true);
     } else if (option == kSSL) {
       globals_->spdy_default_protocol.set(net::kProtoSPDY2);
       net::HttpStreamFactory::set_force_spdy_over_ssl(true);
@@ skipping 26 matching lines @@
   }
 }
 
 // static
 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterStringPref(prefs::kAuthSchemes,
                                "basic,digest,ntlm,negotiate,"
                                "spdyproxy");
   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
-  registry->RegisterStringPref(prefs::kAuthServerWhitelist, "");
-  registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist, "");
-  registry->RegisterStringPref(prefs::kGSSAPILibraryName, "");
-  registry->RegisterStringPref(prefs::kSpdyProxyAuthOrigin, "");
+  registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
+  registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
+                               std::string());
+  registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
+  registry->RegisterStringPref(prefs::kSpdyProxyAuthOrigin, std::string());
   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
   registry->RegisterInt64Pref(prefs::kHttpReceivedContentLength, 0);
   registry->RegisterInt64Pref(prefs::kHttpOriginalContentLength, 0);
 #if defined(OS_ANDROID) || defined(OS_IOS)
   registry->RegisterListPref(prefs::kDailyHttpOriginalContentLength);
   registry->RegisterListPref(prefs::kDailyHttpReceivedContentLength);
   registry->RegisterInt64Pref(prefs::kDailyHttpContentLengthLastUpdateDate, 0L);
 #endif
   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
 }
@@ skipping 148 matching lines @@
   globals_->system_request_context.reset(
       ConstructSystemRequestContext(globals_, net_log_));
 
   sdch_manager_->set_sdch_fetcher(
       new SdchDictionaryFetcher(system_url_request_context_getter_.get()));
 }
 
 void IOThread::UpdateDnsClientEnabled() {
   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
 }