Fix a time conversion bug on webrtc-internals.

content/browser/media/webrtc_internals.cc

Index: content/browser/media/webrtc_internals.cc
diff --git a/content/browser/media/webrtc_internals.cc b/content/browser/media/webrtc_internals.cc
index 03afc1103d3ed282d457b190b7a7016a687acd86..09f0e5a0ed42f3d5ef16820f7c2afbf3bb612297 100644
--- a/content/browser/media/webrtc_internals.cc
+++ b/content/browser/media/webrtc_internals.cc
@@ -137,8 +137,8 @@ void WebRTCInternals::OnUpdatePeerConnection(
     if (!log_entry)
       return;
 
-    int64 milliseconds = (base::Time::Now() - base::Time()).InMilliseconds();
-    string time = base::Int64ToString(milliseconds);
+    double epoch_time = base::Time::Now().ToJsTime();
+    string time = base::DoubleToString(epoch_time);
     log_entry->SetString("time", time);
     log_entry->SetString("type", type);
     log_entry->SetString("value", value);