Crash if UTS46 data doesn't load at startup

url/url_canon_icu.cc

Index: url/url_canon_icu.cc
diff --git a/url/url_canon_icu.cc b/url/url_canon_icu.cc
index 741bed22abf09f0e9b1eb778f67fc3ae155a5ee5..8a80d7109d9cc925090ee247ef17253eb53136bb 100644
--- a/url/url_canon_icu.cc
+++ b/url/url_canon_icu.cc
@@ -99,8 +99,10 @@ struct UIDNAWrapper {
     // TODO(jungshik): Change options as different parties (browsers,
     // registrars, search engines) converge toward a consensus.
     value = uidna_openUTS46(UIDNA_CHECK_BIDI, &err);
-    if (U_FAILURE(err))
+    if (U_FAILURE(err)) {
+      CHECK(false) << "failed to open UTS46 data with error: " << err;
       value = NULL;
+    }
   }
 
   UIDNA* value;