Push API: Avoid false positive DCHECK.

chrome/browser/push_messaging/push_messaging_app_identifier_unittest.cc

Index: chrome/browser/push_messaging/push_messaging_app_identifier_unittest.cc
diff --git a/chrome/browser/push_messaging/push_messaging_app_identifier_unittest.cc b/chrome/browser/push_messaging/push_messaging_app_identifier_unittest.cc
index 0275b2bba05d7b905f9d0d3ed3ed535df6ce9fcd..862c7dc827b4c387fc9136fc5e1ec42ccf8ddcc3 100644
--- a/chrome/browser/push_messaging/push_messaging_app_identifier_unittest.cc
+++ b/chrome/browser/push_messaging/push_messaging_app_identifier_unittest.cc
@@ -76,6 +76,13 @@ TEST_F(PushMessagingAppIdentifierTest, UniqueGuids) {
                 GURL("https://www.example.com/"), 1).app_id());
 }
 
+TEST_F(PushMessagingAppIdentifierTest, FindInvalidAppId) {
+  // These calls to FindByAppId should not DCHECK.
+  EXPECT_TRUE(PushMessagingAppIdentifier::FindByAppId(profile(), "").is_null());
+  EXPECT_TRUE(PushMessagingAppIdentifier::FindByAppId(
+      profile(), "amhfneadkjmnlefnpidcijoldiibcdnd").is_null());
+}
+
 TEST_F(PushMessagingAppIdentifierTest, PersistAndFind) {
   ASSERT_TRUE(PushMessagingAppIdentifier::FindByAppId(
       profile(), original_.app_id()).is_null());