Clean up some uses of Failures and MaybeObjects.

src/execution.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 "execution.h"
 
 #include "bootstrapper.h"
 #include "codegen.h"
 #include "deoptimizer.h"
 #include "isolate-inl.h"
@@ skipping 96 matching lines @@
     // Reset stepping state when script exits with uncaught exception.
     if (isolate->debugger()->IsDebuggerActive()) {
       isolate->debug()->ClearStepping();
     }
 #endif  // ENABLE_DEBUGGER_SUPPORT
     return MaybeHandle<Object>();
   } else {
     isolate->clear_pending_message();
   }
 
-  return Handle<Object>(value->ToObjectUnchecked(), isolate);
+  return Handle<Object>(value, isolate);
 }
 
 
 MaybeHandle<Object> Execution::Call(Isolate* isolate,
                                     Handle<Object> callable,
                                     Handle<Object> receiver,
                                     int argc,
                                     Handle<Object> argv[],
                                     bool convert_receiver) {
   if (!callable->IsJSFunction()) {
@@ skipping 857 matching lines @@
   if (stack_guard->IsInstallCodeRequest()) {
     ASSERT(isolate->concurrent_recompilation_enabled());
     stack_guard->Continue(INSTALL_CODE);
     isolate->optimizing_compiler_thread()->InstallOptimizedFunctions();
   }
   isolate->runtime_profiler()->OptimizeNow();
   return isolate->heap()->undefined_value();
 }
 
 } }  // namespace v8::internal