[Sync] Enable SyncDoNotCommitBookmarksWithoutFavicon by default

This feature toggle disables commits of bookmarks if favicon is still
loading.

Bug: 1061411.
Change-Id: Ie7f1a6f3ad4a809e1c1cb3e112a0582ca0bf38f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2235692
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779263}

components/sync_bookmarks/switches.cc

@@ -7,8 +7,7 @@
 namespace switches {
 
 const base::Feature kSyncDoNotCommitBookmarksWithoutFavicon = {
-    "SyncDoNotCommitBookmarksWithoutFavicon",
-    base::FEATURE_DISABLED_BY_DEFAULT};
+    "SyncDoNotCommitBookmarksWithoutFavicon", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables updating a BookmarkNode's GUID by replacing the node itself.
 const base::Feature kUpdateBookmarkGUIDWithNodeReplacement{