Remove assertion from callers of TryCall.

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 722 matching lines @@
   Handle<Object> char_at = Object::GetProperty(
       isolate->js_builtins_object(),
       factory->char_at_string()).ToHandleChecked();
   if (!char_at->IsJSFunction()) {
     return factory->undefined_value();
   }
 
   Handle<Object> index_object = factory->NewNumberFromInt(int_index);
   Handle<Object> index_arg[] = { index_object };
   Handle<Object> result;
-  ASSIGN_RETURN_ON_EXCEPTION_VALUE(
-      isolate, result,
-      TryCall(Handle<JSFunction>::cast(char_at),
-              string,
-              ARRAY_SIZE(index_arg),
-              index_arg),
-      factory->undefined_value());
+  if (!TryCall(Handle<JSFunction>::cast(char_at),
+               string,
+               ARRAY_SIZE(index_arg),
+               index_arg).ToHandle(&result)) {
+    return factory->undefined_value();
+  }
   return result;
 }
 
 
 MaybeHandle<JSFunction> Execution::InstantiateFunction(
     Handle<FunctionTemplateInfo> data) {
   Isolate* isolate = data->GetIsolate();
   if (!data->do_not_cache()) {
     // Fast case: see if the function has already been instantiated
     int serial_number = Smi::cast(data->serial_number())->value();
@@ skipping 226 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