Delete both regular and Metro user data dirs on uninstall.

chrome/installer/util/google_chrome_distribution.cc

Index: chrome/installer/util/google_chrome_distribution.cc
diff --git a/chrome/installer/util/google_chrome_distribution.cc b/chrome/installer/util/google_chrome_distribution.cc
index b340873df6e72c9e7b65820d3fa1e539319dc76e..2cb98940aba76c988208b7b620dd0f8b3de20d71 100644
--- a/chrome/installer/util/google_chrome_distribution.cc
+++ b/chrome/installer/util/google_chrome_distribution.cc
@@ -764,14 +764,20 @@ void GoogleChromeDistribution::LaunchUserExperiment(
       }
     }
     // Check browser usage inactivity by the age of the last-write time of the
-    // chrome user data directory.
-    FilePath user_data_dir(product.GetUserDataPath());
+    // most recently-used chrome user data directory.
+    std::vector<FilePath> user_data_dirs;
+    product.GetUserDataPaths(&user_data_dirs);
+    int dir_age_hours = -1;
+    for (size_t i = 0; i < user_data_dirs.size(); ++i) {
+      int this_age = GetDirectoryWriteAgeInHours(
+          user_data_dirs[i].value().c_str());
+      if (this_age >= 0 && (dir_age_hours < 0 || this_age < dir_age_hours))
+        dir_age_hours = this_age;
+    }
 
     const bool experiment_enabled = false;
     const int kThirtyDays = 30 * 24;
 
-    int dir_age_hours = GetDirectoryWriteAgeInHours(
-        user_data_dir.value().c_str());
     if (!experiment_enabled) {
       VLOG(1) << "Toast experiment is disabled.";
       return;