predictors: Take RESOURCE_TYPE_XHR into account.

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 4ad1343e9c1b0e528b3ef1cfe42825cff7333e48..bf1e16092a4558a1f713c3a90582ebee9a49289d 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
@@ -1163,6 +1163,12 @@ TEST_F(ResourcePrefetchPredictorTest, HandledResourceTypes) {
       content::RESOURCE_TYPE_PREFETCH, "application/font-woff"));
   EXPECT_TRUE(ResourcePrefetchPredictor::IsHandledResourceType(
       content::RESOURCE_TYPE_PREFETCH, "font/woff2"));
+  EXPECT_FALSE(ResourcePrefetchPredictor::IsHandledResourceType(
+      content::RESOURCE_TYPE_XHR, ""));
+  EXPECT_FALSE(ResourcePrefetchPredictor::IsHandledResourceType(
+      content::RESOURCE_TYPE_XHR, "bogus/mime-type"));
+  EXPECT_TRUE(ResourcePrefetchPredictor::IsHandledResourceType(
+      content::RESOURCE_TYPE_XHR, "application/javascript"));
 }
 
 TEST_F(ResourcePrefetchPredictorTest, ShouldRecordRequestMainFrame) {