WTF::notFound looks too much like a local variable.

Source/modules/mediastream/RTCPeerConnection.cpp

Index: Source/modules/mediastream/RTCPeerConnection.cpp
diff --git a/Source/modules/mediastream/RTCPeerConnection.cpp b/Source/modules/mediastream/RTCPeerConnection.cpp
index bbbf993d46b9217086dafd8b14fe8e6dc6995883..a243d1ccb25e7d0f9722855c3572f376c0874e3e 100644
--- a/Source/modules/mediastream/RTCPeerConnection.cpp
+++ b/Source/modules/mediastream/RTCPeerConnection.cpp
@@ -418,7 +418,7 @@ void RTCPeerConnection::removeStream(PassRefPtr<MediaStream> prpStream, Exceptio
     RefPtr<MediaStream> stream = prpStream;
 
     size_t pos = m_localStreams.find(stream);
-    if (pos == notFound)
+    if (pos == kNotFound)
         return;
 
     m_localStreams.remove(pos);
@@ -595,7 +595,7 @@ void RTCPeerConnection::didRemoveRemoteStream(MediaStreamDescriptor* streamDescr
         return;
 
     size_t pos = m_remoteStreams.find(stream);
-    ASSERT(pos != notFound);
+    ASSERT(pos != kNotFound);
     m_remoteStreams.remove(pos);
 
     scheduleDispatchEvent(MediaStreamEvent::create(eventNames().removestreamEvent, false, false, stream.release()));