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

google_apis/google_api_keys.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 "google_apis/google_api_keys.h"
 
 // If you add more includes to this list, you also need to add them to
 // google_api_keys_unittest.cc.
 #include "base/command_line.h"
 #include "base/environment.h"
@@ skipping 80 matching lines @@
 
 // This is used as a lazy instance to determine keys once and cache them.
 class APIKeyCache {
  public:
   APIKeyCache() {
     scoped_ptr<base::Environment> environment(base::Environment::Create());
     CommandLine* command_line = CommandLine::ForCurrentProcess();
 
     api_key_ = CalculateKeyValue(GOOGLE_API_KEY,
                                  STRINGIZE_NO_EXPANSION(GOOGLE_API_KEY),
-                                 NULL, "",
+                                 NULL,
+                                 std::string(),
                                  environment.get(),
                                  command_line);
 
-    std::string default_client_id = CalculateKeyValue(
-        GOOGLE_DEFAULT_CLIENT_ID,
-        STRINGIZE_NO_EXPANSION(GOOGLE_DEFAULT_CLIENT_ID),
-        NULL, "",
-        environment.get(),
-        command_line);
-    std::string default_client_secret = CalculateKeyValue(
-        GOOGLE_DEFAULT_CLIENT_SECRET,
-        STRINGIZE_NO_EXPANSION(GOOGLE_DEFAULT_CLIENT_SECRET),
-        NULL, "",
-        environment.get(),
-        command_line);
+    std::string default_client_id =
+        CalculateKeyValue(GOOGLE_DEFAULT_CLIENT_ID,
+                          STRINGIZE_NO_EXPANSION(GOOGLE_DEFAULT_CLIENT_ID),
+                          NULL,
+                          std::string(),
+                          environment.get(),
+                          command_line);
+    std::string default_client_secret =
+        CalculateKeyValue(GOOGLE_DEFAULT_CLIENT_SECRET,
+                          STRINGIZE_NO_EXPANSION(GOOGLE_DEFAULT_CLIENT_SECRET),
+                          NULL,
+                          std::string(),
+                          environment.get(),
+                          command_line);
 
     // We currently only allow overriding the baked-in values for the
     // default OAuth2 client ID and secret using a command-line
     // argument, since that is useful to enable testing against
     // staging servers, and since that was what was possible and
     // likely practiced by the QA team before this implementation was
     // written.
     client_ids_[CLIENT_MAIN] = CalculateKeyValue(
         GOOGLE_CLIENT_ID_MAIN,
         STRINGIZE_NO_EXPANSION(GOOGLE_CLIENT_ID_MAIN),
@@ skipping 111 matching lines @@
 
 std::string GetOAuth2ClientID(OAuth2Client client) {
   return g_api_key_cache.Get().GetClientID(client);
 }
 
 std::string GetOAuth2ClientSecret(OAuth2Client client) {
   return g_api_key_cache.Get().GetClientSecret(client);
 }
 
 }  // namespace google_apis