binding: Makes Dictionary::hasProperty rethrow an exception.

third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
index c58565ae8451b22e0c1cf7e6c2920d0058897b31..2bc5aaa750f8ca1a70b2e71604aeccb131bfed48 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.cpp
@@ -850,7 +850,7 @@ ScriptPromise RTCPeerConnection::generateCertificate(
   Nullable<DOMTimeStamp> expires;
   if (keygenAlgorithm.isDictionary()) {
     Dictionary keygenAlgorithmDict = keygenAlgorithm.getAsDictionary();
-    if (keygenAlgorithmDict.hasProperty("expires")) {
+    if (keygenAlgorithmDict.hasProperty("expires", exceptionState)) {
       v8::Local<v8::Value> expiresValue;
       keygenAlgorithmDict.get("expires", expiresValue);
       if (expiresValue->IsNumber()) {
@@ -864,6 +864,9 @@ ScriptPromise RTCPeerConnection::generateCertificate(
       }
     }
   }
+  if (exceptionState.hadException()) {
+    return ScriptPromise();
+  }
 
   // Convert from WebCrypto representation to recognized WebRTCKeyParams. WebRTC
   // supports a small subset of what are valid AlgorithmIdentifiers.