Add base:: to string16 in extensions/.

extensions/browser/test_management_policy.cc

Index: extensions/browser/test_management_policy.cc
diff --git a/extensions/browser/test_management_policy.cc b/extensions/browser/test_management_policy.cc
index a2c5404dd4054429d60eb01ffe2780a1e7f9370a..5c78efe6b2a475e62325d2ef74c1ec7c28826df8 100644
--- a/extensions/browser/test_management_policy.cc
+++ b/extensions/browser/test_management_policy.cc
@@ -41,21 +41,22 @@ std::string TestManagementPolicyProvider::GetDebugPolicyProviderName() const {
 }
 
 bool TestManagementPolicyProvider::UserMayLoad(const Extension* extension,
-                                               string16* error) const {
+                                               base::string16* error) const {
   if (error && !may_load_)
     *error = error_message_;
   return may_load_;
 }
 
 bool TestManagementPolicyProvider::UserMayModifySettings(
-    const Extension* extension, string16* error) const {
+    const Extension* extension, base::string16* error) const {
   if (error && !may_modify_status_)
     *error = error_message_;
   return may_modify_status_;
 }
 
 bool TestManagementPolicyProvider::MustRemainEnabled(const Extension* extension,
-                                                     string16* error) const {
+                                                     base::string16* error)
+    const {
   if (error && must_remain_enabled_)
     *error = error_message_;
   return must_remain_enabled_;
@@ -64,7 +65,7 @@ bool TestManagementPolicyProvider::MustRemainEnabled(const Extension* extension,
 bool TestManagementPolicyProvider::MustRemainDisabled(
     const Extension* extension,
     Extension::DisableReason* reason,
-    string16* error) const {
+    base::string16* error) const {
   if (must_remain_disabled_) {
     if (error)
       *error = error_message_;