Use v8::TryCatch in toImplSequence

third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp b/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
index 95446d8c2c24dfd8f6babf5160d96b2dd564d0a3..76ca1263094f78a0b2895652f1f5fe97f84566a9 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
@@ -897,30 +897,35 @@ v8::Local<v8::Function> getBoundFunction(v8::Local<v8::Function> function) {
              : function;
 }
 
-v8::MaybeLocal<v8::Object> getEsIterator(v8::Isolate* isolate,
-                                         v8::Local<v8::Object> object,
-                                         ExceptionState& exceptionState) {
+v8::Local<v8::Object> getEsIterator(v8::Isolate* isolate,
+                                    v8::Local<v8::Object> object,
+                                    ExceptionState& exceptionState) {
+  v8::TryCatch block(isolate);
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> iteratorGetter;
   if (!object->Get(context, v8::Symbol::GetIterator(isolate))
-           .ToLocal(&iteratorGetter))
-    return v8::MaybeLocal<v8::Object>();
+           .ToLocal(&iteratorGetter)) {
+    exceptionState.rethrowV8Exception(block.Exception());
+    return v8::Local<v8::Object>();
+  }
   if (!iteratorGetter->IsFunction()) {
     exceptionState.throwTypeError("Iterator getter is not callable.");
-    return v8::MaybeLocal<v8::Object>();
+    return v8::Local<v8::Object>();
   }
 
   v8::Local<v8::Function> getterFunction = iteratorGetter.As<v8::Function>();
   v8::Local<v8::Value> iterator;
   if (!V8ScriptRunner::callFunction(getterFunction, toExecutionContext(context),
                                     object, 0, nullptr, isolate)
-           .ToLocal(&iterator))
-    return v8::MaybeLocal<v8::Object>();
+           .ToLocal(&iterator)) {
+    exceptionState.rethrowV8Exception(block.Exception());
+    return v8::Local<v8::Object>();
+  }
   if (!iterator->IsObject()) {
     exceptionState.throwTypeError("Iterator is not an object.");
-    return v8::MaybeLocal<v8::Object>();
+    return v8::Local<v8::Object>();
   }
-  return v8::MaybeLocal<v8::Object>(iterator.As<v8::Object>());
+  return iterator.As<v8::Object>();
 }
 
 bool addHiddenValueToArray(v8::Isolate* isolate,