Switch from using internal constraints to use explicit PeerConnectionFactoryInterface::SetOptions t…

content/renderer/media/rtc_media_constraints.cc

Index: content/renderer/media/rtc_media_constraints.cc
diff --git a/content/renderer/media/rtc_media_constraints.cc b/content/renderer/media/rtc_media_constraints.cc
index 7fa9791f2ebbcd23db32b5a1118467cdd220943d..06d6715a4f7a5a258e82086d5c7be53334c5c5d8 100644
--- a/content/renderer/media/rtc_media_constraints.cc
+++ b/content/renderer/media/rtc_media_constraints.cc
@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 #include "content/renderer/media/rtc_media_constraints.h"
 
+#include <string>
+
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "content/common/media/media_stream_options.h"
@@ -28,11 +30,12 @@ void GetNativeMediaConstraints(
       continue;
 
     // Ignore internal constraints set by JS.
-    // TODO(jiayl): replace the hard coded string with
-    // webrtc::MediaConstraintsInterface::kInternalConstraintPrefix when
-    // the Libjingle change is rolled.
-    if (StartsWithASCII(new_constraint.key, "internal", true))
+    if (StartsWithASCII(
+        new_constraint.key,
+        webrtc::MediaConstraintsInterface::kInternalConstraintPrefix,
+        true)) {
       continue;
+    }
 
     DVLOG(3) << "MediaStreamConstraints:" << new_constraint.key
              << " : " <<  new_constraint.value;