[ios] Change EmbedderBlockRestoreUrl default official value.

Bug: 1007337
Change-Id: Ib1049641e3035846e6e26ca545206dc28e576ece
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1929266
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718157}

ios/chrome/browser/ui/ui_feature_flags.cc

@@ -29,7 +29,7 @@ const base::Feature kLanguageSettings{"LanguageSettings",
                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kEmbedderBlockRestoreUrl{"EmbedderBlockRestoreUrl",
-                                             base::FEATURE_ENABLED_BY_DEFAULT};
+                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kDisableAnimationOnLowBattery{
     "DisableAnimationOnLowBattery", base::FEATURE_DISABLED_BY_DEFAULT};