Add base:: to string16s in chrome/.

chrome/installer/util/user_experiment.h

 // Copyright 2013 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.
 //
 // This files declares a class that contains methods and data to conduct
 // for user expeirments.
 
 #ifndef CHROME_INSTALLER_UTIL_USER_EXPERIMENT_H_
 #define CHROME_INSTALLER_UTIL_USER_EXPERIMENT_H_
 
@@ skipping 15 matching lines @@
   kToastUiUninstall          = 1 << 0,  // Uninstall radio button.
   kToastUiDontBugMeAsButton  = 1 << 1,  // This is a button, not a radio button.
   kToastUiWhyLink            = 1 << 2,  // Has the 'why I am seeing this' link.
   kToastUiMakeDefault        = 1 << 3,  // Has the 'make it default' checkbox.
 };
 
 // A struct for communicating what a UserExperiment contains. In these
 // experiments we show toasts to the user if they are inactive for a certain
 // amount of time.
 struct ExperimentDetails {
-  string16 prefix;      // The experiment code prefix for this experiment,
-                        // also known as the 'TV' part in 'TV80'.
+  base::string16 prefix;  // The experiment code prefix for this experiment,
+                          // also known as the 'TV' part in 'TV80'.
   int flavor;           // The flavor index for this experiment.
   int heading;          // The heading resource ID to use for this experiment.
   int flags;            // See ToastUIFlags above.
   int control_group;    // Size of the control group (in percentages). Control
                         // group is the group that qualifies for the
                         // experiment but does not participate.
 };
 
 // Creates the experiment details for a given language-brand combo.
 // If |flavor| is -1, then a flavor will be selected at random. |experiment|
 // is the struct you want to write the experiment information to.
 // Returns false if no experiment details could be gathered.
 bool CreateExperimentDetails(int flavor, ExperimentDetails* experiment);
 
 // After an install or upgrade the user might qualify to participate in an
 // experiment. This function determines if the user qualifies and if so it
 // sets the wheels in motion or in simple cases does the experiment itself.
 void LaunchBrowserUserExperiment(const CommandLine& base_command,
                                  InstallStatus status,
                                  bool system_level);
 
 // The user has qualified for the inactive user toast experiment and this
 // function just performs it.
 void InactiveUserToastExperiment(int flavor,
-                                 const string16& experiment_group,
+                                 const base::string16& experiment_group,
                                  const Product& product,
                                  const base::FilePath& application_path);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_USER_EXPERIMENT_H_