predictors: Fix duplicate content type detection.

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 91246aa664f39264202c0fb237eea752e0d85e8f..52747307a4e12df6781f2533426baa32ee8b7950 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
@@ -96,10 +96,8 @@ class ResourcePrefetchPredictorTest : public testing::Test {
   NavigationID CreateNavigationID(int process_id,
                                   int render_frame_id,
                                   const std::string& main_frame_url) {
-    NavigationID navigation_id;
-    navigation_id.render_process_id = process_id;
-    navigation_id.render_frame_id = render_frame_id;
-    navigation_id.main_frame_url = GURL(main_frame_url);
+    NavigationID navigation_id(process_id, render_frame_id,
+                               GURL(main_frame_url));
     navigation_id.creation_time = base::TimeTicks::Now();
     return navigation_id;
   }