Reduce boilerplace for common pattern to return MaybeHandle.

src/runtime/runtime-uri.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
 #include "src/objects-inl.h"
@@ skipping 246 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_URIEscape) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
   Handle<String> source;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, source,
                                      Object::ToString(isolate, input));
   source = String::Flatten(source);
-  Handle<String> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, source->IsOneByteRepresentationUnderneath()
-                           ? URIEscape::Escape<uint8_t>(isolate, source)
-                           : URIEscape::Escape<uc16>(isolate, source));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate,
+                           source->IsOneByteRepresentationUnderneath()
+                               ? URIEscape::Escape<uint8_t>(isolate, source)
+                               : URIEscape::Escape<uc16>(isolate, source));
 }
 
 
 RUNTIME_FUNCTION(Runtime_URIUnescape) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
   Handle<String> source;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, source,
                                      Object::ToString(isolate, input));
   source = String::Flatten(source);
-  Handle<String> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, source->IsOneByteRepresentationUnderneath()
-                           ? URIUnescape::Unescape<uint8_t>(isolate, source)
-                           : URIUnescape::Unescape<uc16>(isolate, source));
-  return *result;
+  RETURN_RESULT_OR_FAILURE(isolate,
+                           source->IsOneByteRepresentationUnderneath()
+                               ? URIUnescape::Unescape<uint8_t>(isolate, source)
+                               : URIUnescape::Unescape<uc16>(isolate, source));
 }
 
 }  // namespace internal
 }  // namespace v8