Using STL to implement functionality in input_method_util.cc

chrome/browser/chromeos/input_method/input_method_util.cc

Index: chrome/browser/chromeos/input_method/input_method_util.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_util.cc b/chrome/browser/chromeos/input_method/input_method_util.cc
index 11f396171916c3e52859310a4a2bfc9fb55b942e..ba721371857a5fa25bd6e3974f3c519710976d0d 100644
--- a/chrome/browser/chromeos/input_method/input_method_util.cc
+++ b/chrome/browser/chromeos/input_method/input_method_util.cc
@@ -10,6 +10,7 @@
 #include <functional>
 #include <map>
 #include <memory>
+#include <unordered_set>
 #include <utility>
 
 #include "base/macros.h"
@@ -687,9 +688,11 @@ bool InputMethodUtil::MigrateInputMethods(
   if (rewritten) {
     // Removes the duplicates.
     std::vector<std::string> new_ids;
+    std::unordered_set<std::string> ids_set;
     for (size_t i = 0; i < ids.size(); ++i) {
-      if (std::find(new_ids.begin(), new_ids.end(), ids[i]) == new_ids.end())
+      if (ids_set.find(ids[i]) == ids_set.end())
         new_ids.push_back(ids[i]);
+      ids_set.insert(ids[i]);
     }
     ids.swap(new_ids);
   }