Add --pull-to-refresh flag for pull-to-refresh

Pull-to-refresh should land behind a flag. There is an unused
--scroll-end-effect flag that was supposed to be used for a related
scroll-end effect feature which was never implemented. This change
renames the flag to use with pull-to-refresh.

BUG=702404
TEST=none

Change-Id: If0d9b4e84ef6515137e1280154bf5dfc31eb4dd6
Reviewed-on: https://chromium-review.googlesource.com/582169
Commit-Queue: Mohsen Izadi <[email protected]>
Reviewed-by: Nick Carter <[email protected]>
Reviewed-by: Sadrul Chowdhury <[email protected]>
Reviewed-by: Jesse Doherty <[email protected]>
Cr-Commit-Position: refs/heads/master@{#490626}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 47e15ed8..3eebd94 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -609,6 +609,9 @@
 extern const char kProtectSyncCredentialOnReauthName[];
 extern const char kProtectSyncCredentialOnReauthDescription[];
 
+extern const char kPullToRefreshName[];
+extern const char kPullToRefreshDescription[];
+
 extern const char kPushApiBackgroundModeName[];
 extern const char kPushApiBackgroundModeDescription[];
 
@@ -636,9 +639,6 @@
 extern const char kSavePageAsMhtmlName[];
 extern const char kSavePageAsMhtmlDescription[];
 
-extern const char kScrollEndEffectName[];
-extern const char kScrollEndEffectDescription[];
-
 extern const char kScrollPredictionName[];
 extern const char kScrollPredictionDescription[];