WebUI Settings: Add a finch flag for content settings redesign

Redesigning the content settings pages with radio buttons and new
strings, behind this flag.

Bug: 1113642
Change-Id: I882f91eca5e353453335838ee7a26188eaa4d780
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316162
Commit-Queue: Tymofii Chudakov <[email protected]>
Reviewed-by: dpapad <[email protected]>
Reviewed-by: Sean Harrison <[email protected]>
Cr-Commit-Position: refs/heads/master@{#795426}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 328bb32..9683244 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1102,6 +1102,9 @@
 extern const char kQuietNotificationPromptsName[];
 extern const char kQuietNotificationPromptsDescription[];
 
+extern const char kContentSettingsRedesignName[];
+extern const char kContentSettingsRedesignDescription[];
+
 extern const char kRawClipboardName[];
 extern const char kRawClipboardDescription[];