Reland of Supervised Users: Create ResourceThrottle only if filtering is enabled

chrome/browser/supervised_user/supervised_user_url_filter_unittest.cc

Index: chrome/browser/supervised_user/supervised_user_url_filter_unittest.cc
diff --git a/chrome/browser/supervised_user/supervised_user_url_filter_unittest.cc b/chrome/browser/supervised_user/supervised_user_url_filter_unittest.cc
index e306abc52c359525643446f13cf1fc76136b6356..bbac7baea694c3a203e4e027ead990f5a0b1f5a0 100644
--- a/chrome/browser/supervised_user/supervised_user_url_filter_unittest.cc
+++ b/chrome/browser/supervised_user/supervised_user_url_filter_unittest.cc
@@ -22,6 +22,7 @@ class SupervisedUserURLFilterTest : public ::testing::Test,
  public:
   SupervisedUserURLFilterTest() : filter_(new SupervisedUserURLFilter) {
     filter_->SetDefaultFilteringBehavior(SupervisedUserURLFilter::BLOCK);
+    filter_->SetEnabled(true);
     filter_->AddObserver(this);
   }
 
@@ -68,6 +69,11 @@ TEST_F(SupervisedUserURLFilterTest, Basic) {
   EXPECT_TRUE(IsURLWhitelisted("chrome://extensions/"));
   EXPECT_TRUE(IsURLWhitelisted("chrome-extension://foo/main.html"));
   EXPECT_TRUE(IsURLWhitelisted("file:///home/chronos/user/Downloads/img.jpg"));
+
+  // If the filter is disabled, everything should be allowed.
+  filter_->SetEnabled(false);
+  EXPECT_TRUE(IsURLWhitelisted("http://google.com"));
+  EXPECT_TRUE(IsURLWhitelisted("http://notgoogle.com/"));
 }
 
 TEST_F(SupervisedUserURLFilterTest, EffectiveURL) {