Move ios_helpers to sdk folder

webrtc/sdk/objc/Framework/Classes/helpers.mm

Index: webrtc/sdk/objc/Framework/Classes/helpers.mm
diff --git a/webrtc/modules/audio_device/ios/helpers_ios.mm b/webrtc/sdk/objc/Framework/Classes/helpers.mm
similarity index 97%
rename from webrtc/modules/audio_device/ios/helpers_ios.mm
rename to webrtc/sdk/objc/Framework/Classes/helpers.mm
index 9a976c0384fc17cb3d76e945024b49ba50e9fc81..3f04421a58f9ba7d5eb406803e9bab4087a5e3a3 100644
--- a/webrtc/modules/audio_device/ios/helpers_ios.mm
+++ b/webrtc/sdk/objc/Framework/Classes/helpers.mm
@@ -19,7 +19,7 @@
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
-#include "webrtc/modules/audio_device/ios/helpers_ios.h"
+#include "webrtc/sdk/objc/Framework/Classes/helpers.h"
 
 namespace webrtc {
 namespace ios {
@@ -86,8 +86,6 @@ const char* LookUpRealName(const char* raw_name) {
   return "";
 }
 
-// TODO(henrika): move to shared location.
-// See https://code.google.com/p/webrtc/issues/detail?id=4773 for details.
 NSString* NSStringFromStdString(const std::string& stdString) {
   // std::string may contain null termination character so we construct
   // using length.