predictors: Disable URL-based learning by default.

chrome/browser/predictors/resource_prefetch_predictor_unittest.cc

Index: chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
diff --git a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
index 460c10af7e5d2f969131db7dfa416fe44739a0a9..e01dcf3f1b851a2ebac48816b56568905a3b4be6 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
@@ -232,8 +232,8 @@ class ResourcePrefetchPredictorTest : public testing::Test {
     config.max_consecutive_misses = 2;
     config.min_resource_confidence_to_trigger_prefetch = 0.5;
 
-    // TODO(shishir): Enable the prefetching mode in the tests.
-    config.mode |= ResourcePrefetchPredictorConfig::LEARNING;
+    config.mode |= ResourcePrefetchPredictorConfig::URL_LEARNING |
+                   ResourcePrefetchPredictorConfig::HOST_LEARNING;
     predictor_.reset(new ResourcePrefetchPredictor(config, profile_.get()));
     predictor_->set_mock_tables(mock_tables_);
   }