bindings: Use V8 MaybeLocal APIs in V8DeviceMotionEventCustom

Source/bindings/modules/v8/custom/V8SQLTransactionCustom.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 47 matching lines @@
     Vector<SQLValue> sqlValues;
 
     if (info.Length() > 1 && !isUndefinedOrNull(info[1])) {
         if (!info[1]->IsObject()) {
             exceptionState.throwDOMException(TypeMismatchError, "The 'arguments' (2nd) argument provided is not an object.");
             exceptionState.throwIfNeeded();
             return;
         }
 
         uint32_t sqlArgsLength = 0;
-        v8::Local<v8::Object> sqlArgsObject = info[1]->ToObject(info.GetIsolate());
+        v8::Local<v8::Object> sqlArgsObject;

[bashi, 2015/03/04 04:42:11]

It seems that vivekg@ is going to remove this custom bindings. I'll use another
call site to test MAYBE_LOCAL_TO_LOCAL_VOID() if this CL looks reasonable.

+        MAYBE_LOCAL_TO_LOCAL_VOID(info.GetIsolate()->GetCurrentContext(), info[1], sqlArgsObject);
         TONATIVE_VOID(v8::Local<v8::Value>, length, sqlArgsObject->Get(v8AtomicString(info.GetIsolate(), "length")));
 
         if (isUndefinedOrNull(length))
             sqlArgsLength = sqlArgsObject->GetPropertyNames()->Length();
         else
             sqlArgsLength = length->Uint32Value();
 
         for (unsigned i = 0; i < sqlArgsLength; ++i) {
             v8::Local<v8::Integer> key = v8::Integer::New(info.GetIsolate(), i);
             TONATIVE_VOID(v8::Local<v8::Value>, value, sqlArgsObject->Get(key));
@@ skipping 33 matching lines @@
         errorCallback = V8SQLStatementErrorCallback::create(v8::Local<v8::Function>::Cast(info[3]), ScriptState::current(info.GetIsolate()));
     } else {
         errorCallback = nullptr;
     }
 
     transaction->executeSQL(statement, sqlValues, callback, errorCallback, exceptionState);
     exceptionState.throwIfNeeded();
 }
 
 } // namespace blink