bindings: Use V8 MaybeLocal APIs in V8DeviceMotionEventCustom

Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp

 /*
  * Copyright (C) 2010 Apple 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 21 matching lines @@
 
 namespace blink {
 
 namespace {
 
 DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> value, v8::Isolate* isolate)
 {
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    CALL_V8_WITH_CHECK_MAYBELOCAL(v8::Object, object, value->ToObject(isolate->GetCurrentContext()), return nullptr);
 
     v8::Local<v8::Value> xValue = object->Get(v8AtomicString(isolate, "x"));
     if (xValue.IsEmpty())
         return nullptr;
     bool canProvideX = !isUndefinedOrNull(xValue);
     double x = xValue->NumberValue();
 
     v8::Local<v8::Value> yValue = object->Get(v8AtomicString(isolate, "y"));
     if (yValue.IsEmpty())
         return nullptr;
@@ skipping 10 matching lines @@
         return nullptr;
 
     return DeviceMotionData::Acceleration::create(canProvideX, x, canProvideY, y, canProvideZ, z);
 }
 
 DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> value, v8::Isolate* isolate)
 {
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    CALL_V8_WITH_CHECK_MAYBELOCAL(v8::Object, object, value->ToObject(isolate->GetCurrentContext()), return nullptr);
 
     v8::Local<v8::Value> alphaValue = object->Get(v8AtomicString(isolate, "alpha"));
     if (alphaValue.IsEmpty())
         return nullptr;
     bool canProvideAlpha = !isUndefinedOrNull(alphaValue);
     double alpha = alphaValue->NumberValue();
 
     v8::Local<v8::Value> betaValue = object->Get(v8AtomicString(isolate, "beta"));
     if (betaValue.IsEmpty())
         return nullptr;
@@ skipping 32 matching lines @@
     if (intervalProvided) {
         interval = toRestrictedDouble(info[6], exceptionState);
         if (exceptionState.throwIfNeeded())
             return;
     }
     DeviceMotionData* deviceMotionData = DeviceMotionData::create(acceleration, accelerationIncludingGravity, rotationRate, intervalProvided, interval);
     impl->initDeviceMotionEvent(type, bubbles, cancelable, deviceMotionData);
 }
 
 } // namespace blink