Make third-party cookie blocking strict by default

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 47d6545831731181e5fea47471872be1ae99b069..585e7d6101bf86a75c54facf22bac8144d4f0d1f 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -1372,16 +1372,6 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
     aura::Desktop::set_use_fullscreen_host_window(true);
 #endif
 
-  // Always add the --block-reading-third-party-cookies flag, if not already
-  // set. We'll leave this on for a bit to determine if we Break The Web for
-  // Canary users.
-  //
-  // TODO(mkwst): Remove this once impact is clear (http://crbug.com/98241).
-  if (!parsed_command_line().HasSwitch(
-      switches::kBlockReadingThirdPartyCookies))
-    CommandLine::ForCurrentProcess()->AppendSwitch(
-        switches::kBlockReadingThirdPartyCookies);
-
   // Convert active labs into switches. Modifies the current command line.
   about_flags::ConvertFlagsToSwitches(local_state,
                                       CommandLine::ForCurrentProcess());