Make WebGLRenderingContext.getSupportedExtensions() return type nullable

Source/bindings/core/v8/custom/V8WebGLRenderingContextCustom.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 452 matching lines @@
         return;
     }
     WebGLShader* shader = V8WebGLShader::toNativeWithTypeCheck(info.GetIsolate(), info[shaderArgumentIndex]);
     unsigned pname = toInt32(info[1], exceptionState);
     if (exceptionState.throwIfNeeded())
         return;
     WebGLGetInfo args = context->getShaderParameter(shader, pname);
     v8SetReturnValue(info, toV8Object(args, info.Holder(), info.GetIsolate()));
 }
 
-void V8WebGLRenderingContext::getSupportedExtensionsMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
-{
-    WebGLRenderingContext* impl = V8WebGLRenderingContext::toNative(info.Holder());
-    if (impl->isContextLost()) {
-        v8SetReturnValueNull(info);
-        return;
-    }
-
-    Vector<String> value = impl->getSupportedExtensions();
-    v8::Local<v8::Array> array = v8::Array::New(info.GetIsolate(), value.size());
-    for (size_t ii = 0; ii < value.size(); ++ii)
-        array->Set(v8::Integer::New(info.GetIsolate(), ii), v8String(info.GetIsolate(), value[ii]));
-    v8SetReturnValue(info, array);
-}
-
 void V8WebGLRenderingContext::getTexParameterMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "getTexParameter", "WebGLRenderingContext", info.Holder(), info.GetIsolate());
     getObjectParameter(info, kTexture, exceptionState);
 }
 
 void V8WebGLRenderingContext::getUniformMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "getUniform", "WebGLRenderingContext", info.Holder(), info.GetIsolate());
     if (info.Length() != 2) {
@@ skipping 359 matching lines @@
     vertexAttribAndUniformHelperf(info, kVertexAttrib3v, exceptionState);
 }
 
 void V8WebGLRenderingContext::vertexAttrib4fvMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "vertexAttrib4fv", "WebGLRenderingContext", info.Holder(), info.GetIsolate());
     vertexAttribAndUniformHelperf(info, kVertexAttrib4v, exceptionState);
 }
 
 } // namespace WebCore