Make IsWKWebViewEnabled not query field trial, command line flags.

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 b6c537c9d1b0c9084b6c28cbe80334e36518a8cb..c266823bfe3f3fa95890090d936089cfc2493529 100644
--- a/ios/chrome/browser/experimental_flags.mm
+++ b/ios/chrome/browser/experimental_flags.mm
@@ -142,27 +142,7 @@ bool CanCheckWKWebViewExperiment() {
 }
 
 bool IsWKWebViewEnabled() {
-  if (!CanCheckWKWebViewExperiment()) {
-    return false;
-  }
-
-  // Now that it's been established that user is a candidate, set up the trial
-  // by checking the group.
-  std::string group_name =
-      base::FieldTrialList::FindFullName(kWKWebViewTrialName);
-
-  // Check if the experimental flag is turned on.
-  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kEnableIOSWKWebView))
-    return true;
-  else if (command_line->HasSwitch(switches::kDisableIOSWKWebView))
-    return false;
-
-  // Check if the finch experiment is turned on.
-  return !base::StartsWith(group_name, "Disabled",
-                           base::CompareCase::INSENSITIVE_ASCII) &&
-         !base::StartsWith(group_name, "Control",
-                           base::CompareCase::INSENSITIVE_ASCII);
+  return true;
 }
 
 bool IsTargetedToWKWebViewExperimentControlGroup() {