Use enum BinaryType for WebSocket.binaryType, instead of DOMString

Source/modules/websockets/DOMWebSocketTest.cpp

Index: Source/modules/websockets/DOMWebSocketTest.cpp
diff --git a/Source/modules/websockets/DOMWebSocketTest.cpp b/Source/modules/websockets/DOMWebSocketTest.cpp
index e21e5a823cd8b34ab90b2f0b4b415790664b1af0..75ac744c470b18ed8156770722a06d6f6ed3fccd 100644
--- a/Source/modules/websockets/DOMWebSocketTest.cpp
+++ b/Source/modules/websockets/DOMWebSocketTest.cpp
@@ -666,23 +666,28 @@ TEST_F(DOMWebSocketTest, binaryType)
 {
     EXPECT_EQ("blob", m_websocket->binaryType());
 
-    m_websocket->setBinaryType("hoge");
-
-    EXPECT_EQ("blob", m_websocket->binaryType());
-
     m_websocket->setBinaryType("arraybuffer");
 
     EXPECT_EQ("arraybuffer", m_websocket->binaryType());
 
-    m_websocket->setBinaryType("fuga");
-
-    EXPECT_EQ("arraybuffer", m_websocket->binaryType());
-
     m_websocket->setBinaryType("blob");
 
     EXPECT_EQ("blob", m_websocket->binaryType());
 }
 
+class DOMWebSocketDeathTest : public DOMWebSocketTestBase, public ::testing::Test {
+public:
+};
+
+TEST_F(DOMWebSocketDeathTest, binaryType)
+{
+    m_websocket->setBinaryType("arraybuffer");
+
+    EXPECT_EQ("arraybuffer", m_websocket->binaryType());
+    EXPECT_DEATH(m_websocket->setBinaryType("hoge"), "");
+    EXPECT_EQ("arraybuffer", m_websocket->binaryType());
+}
+
 // FIXME: We should add tests for suspend / resume.
 
 class DOMWebSocketValidClosingTest : public DOMWebSocketTestBase, public ::testing::TestWithParam<unsigned short> {