bindings: Use V8 MaybeLocal APIs in V8DeviceMotionEventCustom

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

Index: Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp
diff --git a/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp b/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp
index be8d12d3809aa2d30125558c971a5792ca2eb8dc..32b87fdbc44418b76bcb53d73507272493dbd801 100644
--- a/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp
+++ b/Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp
@@ -39,8 +39,9 @@ DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> va
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    v8::Local<v8::Object> object;
+    if (!value->ToObject(isolate->GetCurrentContext()).ToLocal(&object))
+        return nullptr;
 
     v8::Local<v8::Value> xValue = object->Get(v8AtomicString(isolate, "x"));
     if (xValue.IsEmpty())
@@ -71,8 +72,9 @@ DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> va
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    v8::Local<v8::Object> object;
+    if (!value->ToObject(isolate->GetCurrentContext()).ToLocal(&object))
+        return nullptr;
 
     v8::Local<v8::Value> alphaValue = object->Get(v8AtomicString(isolate, "alpha"));
     if (alphaValue.IsEmpty())