Migrate about:flags messages to const char*

ios/chrome/browser/ios_chrome_flags_descriptions.cc

Index: ios/chrome/browser/ios_chrome_flags_descriptions.cc
diff --git a/ios/chrome/browser/ios_chrome_flags_descriptions.cc b/ios/chrome/browser/ios_chrome_flags_descriptions.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2df3e264cad2d5410732ded1b68598353bb4a570
--- /dev/null
+++ b/ios/chrome/browser/ios_chrome_flags_descriptions.cc
@@ -0,0 +1,25 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ios/chrome/browser/ios_chrome_flags_descriptions.h"
+
+namespace flags_descriptions {
+
+const char kBrowserTaskSchedulerDescription[] =
+    "Enables redirection of some task posting APIs to the task scheduler.";
+
+const char kBrowserTaskSchedulerName[] = "Task Scheduler";
+
+const char kContextualSearch[] = "Contextual Search";
+
+const char kContextualSearchDescription[] =
+    "Whether or not Contextual Search is enabled.";
+
+const char kPhysicalWeb[] = "Physical Web";
+
+const char kPhysicalWebDescription[] =
+    "When enabled, the omnibox will include suggestions for web pages "
+    "broadcast by devices near you.";
+
+}  // namespace flags_descriptions