Add recommended extension installation support

extensions/browser/management_policy_unittest.cc

Index: extensions/browser/management_policy_unittest.cc
diff --git a/extensions/browser/management_policy_unittest.cc b/extensions/browser/management_policy_unittest.cc
index 52373c135ba75b1638b1a60280d690884bf7a103..bcedc2c7e2892bfb7d191c5f5cb6f6e30e2c0d30 100644
--- a/extensions/browser/management_policy_unittest.cc
+++ b/extensions/browser/management_policy_unittest.cc
@@ -22,6 +22,8 @@ class ManagementPolicyTest : public testing::Test {
     must_remain_disabled_.SetProhibitedActions(
         TestProvider::MUST_REMAIN_DISABLED);
     must_remain_disabled_.SetDisableReason(Extension::DISABLE_SIDELOAD_WIPEOUT);
+    must_remain_installed_.SetProhibitedActions(
+        TestProvider::MUST_REMAIN_INSTALLED);
     restrict_all_.SetProhibitedActions(TestProvider::PROHIBIT_MODIFY_STATUS |
                                        TestProvider::PROHIBIT_LOAD |
                                        TestProvider::MUST_REMAIN_ENABLED);
@@ -35,6 +37,7 @@ class ManagementPolicyTest : public testing::Test {
   TestProvider no_load_;
   TestProvider must_remain_enabled_;
   TestProvider must_remain_disabled_;
+  TestProvider must_remain_installed_;
   TestProvider restrict_all_;
 };
 
@@ -176,6 +179,34 @@ TEST_F(ManagementPolicyTest, MustRemainDisabled) {
   EXPECT_TRUE(error.empty());
 }
 
+TEST_F(ManagementPolicyTest, MustRemainInstalled) {
+  // No providers registered.
+  base::string16 error;
+  EXPECT_FALSE(policy_.MustRemainInstalled(NULL, &error));
+  EXPECT_TRUE(error.empty());
+
+  // One provider, no relevant restriction.
+  policy_.RegisterProvider(&allow_all_);
+  EXPECT_FALSE(policy_.MustRemainInstalled(NULL, &error));
+  EXPECT_TRUE(error.empty());
+
+  // Two providers, no relevant restrictions.
+  policy_.RegisterProvider(&no_modify_status_);
+  EXPECT_FALSE(policy_.MustRemainInstalled(NULL, &error));
+  EXPECT_TRUE(error.empty());
+
+  // Three providers, one with a relevant restriction.
+  policy_.RegisterProvider(&must_remain_installed_);
+  EXPECT_TRUE(policy_.MustRemainInstalled(NULL, &error));
+  EXPECT_FALSE(error.empty());
+
+  // Remove the restriction.
+  policy_.UnregisterProvider(&must_remain_installed_);
+  error.clear();
+  EXPECT_FALSE(policy_.MustRemainInstalled(NULL, &error));
+  EXPECT_TRUE(error.empty());
+}
+
 // Tests error handling in the ManagementPolicy.
 TEST_F(ManagementPolicyTest, ErrorHandling) {
   // The error parameter should be unchanged if no restriction was found.