[SendTabToSelf] Move the secondary feature flag to toggle the Send UI

The sync feature flag already effectivly gates receiveing, so rolling
out a flag that just toggles the UI is a better two part stratagy.

Original CL:
https://chromium-review.googlesource.com/c/chromium/src/+/1540271

Bug: 937004
Change-Id: I486d492a068760876d485378c9809916005d086e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1552399
Commit-Queue: Tanya Gupta <[email protected]>
Reviewed-by: Mikel Astiz <[email protected]>
Reviewed-by: sebsg <[email protected]>
Cr-Commit-Position: refs/heads/master@{#648819}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index b9e8a06e..7a27050 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3719,10 +3719,10 @@
      flag_descriptions::kSendTabToSelfDescription, kOsAll,
      FEATURE_VALUE_TYPE(switches::kSyncSendTabToSelf)},
 
-    {"enable-send-tab-to-self-receive",
-     flag_descriptions::kSendTabToSelfReceiveName,
-     flag_descriptions::kSendTabToSelfReceiveDescription, kOsAll,
-     FEATURE_VALUE_TYPE(send_tab_to_self::kSendTabToSelfReceive)},
+    {"enable-send-tab-to-self-show-sending-ui",
+     flag_descriptions::kSendTabToSelfShowSendingUIName,
+     flag_descriptions::kSendTabToSelfShowSendingUIDescription, kOsAll,
+     FEATURE_VALUE_TYPE(send_tab_to_self::kSendTabToSelfShowSendingUI)},
 
     {"enable-data-reduction-proxy-with-network-service",
      flag_descriptions::kEnableDataReductionProxyNetworkServiceName,