Enable enhanced bookmarks by default on iOS.

ios/chrome/browser/experimental_flags.mm

Index: ios/chrome/browser/experimental_flags.mm
diff --git a/ios/chrome/browser/experimental_flags.mm b/ios/chrome/browser/experimental_flags.mm
index 8dcf78ec088faac9e4a61eb202260d5942a28cf1..09d606b769b59674dcff0a164df6caf45cbd41c1 100644
--- a/ios/chrome/browser/experimental_flags.mm
+++ b/ios/chrome/browser/experimental_flags.mm
@@ -15,7 +15,6 @@
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
 #include "components/autofill/core/common/autofill_switches.h"
-#include "components/enhanced_bookmarks/enhanced_bookmark_features.h"
 #include "components/variations/variations_associated_data.h"
 #include "ios/chrome/browser/chrome_switches.h"
 #include "ios/web/public/web_view_creation_util.h"
@@ -46,7 +45,23 @@ bool IsAlertOnBackgroundUploadEnabled() {
 }
 
 bool IsBookmarkCollectionEnabled() {
-  return enhanced_bookmarks::IsEnhancedBookmarksEnabled();
+  // kEnhancedBookmarksExperiment flag could have values "", "1" and "0".  "" -

[lpromero, 2015/12/02 17:37:08]

This doesn't wrap nicely. Add a new line after "0".

[stkhapugin, 2015/12/04 16:55:59]

Done.

+  // default, "0" - user opted out, "1" - user opted in.  Tests also use the
+  // command line flag to force enhanced bookmark to be on.
+  // The default behavior is Opt In.

[lpromero, 2015/12/02 17:37:08]

I wouldn’t add this comment here. The following lines are for checking OptIn and
OptOut. Default is dealt with later. (The comment would get stale easily if not
close to the code it comments.)

[stkhapugin, 2015/12/04 16:55:59]

Done.

+  std::string switch_value =
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kEnhancedBookmarksExperiment);
+  if (switch_value == "1")
+    return true;
+  if (switch_value == "0")
+    return false;
+
+  // Check if the finch experiment is turned on.
+  std::string group_name =
+      base::FieldTrialList::FindFullName("IOSNewBookmarksUI");
+  return !base::StartsWith(group_name, "Disabled",
+                           base::CompareCase::INSENSITIVE_ASCII);
 }
 
 void SetWKWebViewTrialEligibility(bool eligible) {