V8ScriptValueSerializer: Use PartitionAlloc for the buffer, and avoid copying it into a String.

third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.cpp

Index: third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.cpp b/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.cpp
index 0984478747948cea40a6a06a54fde621e53d48de..92a7919d8fc74b9fe8222c4f0b7bf2f916eda8e3 100644
--- a/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.cpp
@@ -29,10 +29,8 @@ V8ScriptValueDeserializer::V8ScriptValueDeserializer(
     : m_scriptState(std::move(scriptState)),
       m_serializedScriptValue(std::move(serializedScriptValue)),
       m_deserializer(m_scriptState->isolate(),
-                     reinterpret_cast<const uint8_t*>(
-                         m_serializedScriptValue->data().ensure16Bit(),
-                         m_serializedScriptValue->data().characters16()),
-                     m_serializedScriptValue->data().length() * 2,
+                     m_serializedScriptValue->data(),
+                     m_serializedScriptValue->dataLengthInBytes(),
                      this) {
   DCHECK(RuntimeEnabledFeatures::v8BasedStructuredCloneEnabled());
   m_deserializer.SetSupportsLegacyWireFormat(true);