[ios] Adds code to support the iOS Handoff feature.

ios/chrome/browser/pref_names.h

Index: ios/chrome/browser/pref_names.h
diff --git a/ios/chrome/browser/pref_names.h b/ios/chrome/browser/pref_names.h
index 5eca97af12a7777ee53ec00baa9d0662539ec0a2..534a339fc6200241378db88f8c999c23db1dc462 100644
--- a/ios/chrome/browser/pref_names.h
+++ b/ios/chrome/browser/pref_names.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_PREF_NAMES_H_
 #define IOS_CHROME_BROWSER_PREF_NAMES_H_
 
-// TODO(rohitrao): Remove this include once embedders are migrated to use the
+// TODO(rohitrao): Remove these includes once embedders are migrated to use the

[erikchen, 2016/11/08 18:13:55]

add a link to a crbug

[rohitrao (ping after 24h), 2016/11/08 19:57:35]

Done.

 // new pref header.
+#include "components/handoff/pref_names_ios.h"
 #include "ios/public/provider/chrome/browser/voice/voice_search_prefs.h"
 
 namespace prefs {
@@ -26,7 +27,6 @@ extern const char kEnableDoNotTrack[];
 extern const char kHttpServerProperties[];
 extern const char kIosBookmarkFolderDefault[];
 extern const char kIosBookmarkPromoAlreadySeen[];
-extern const char kIosHandoffToOtherDevices[];
 extern const char kIosPhysicalWebEnabled[];
 extern const char kLastSessionExitedCleanly[];
 extern const char kMetricsReportingWifiOnly[];