Remove base/mac/scoped_nsexception_enabler.h.

base/mac/scoped_nsexception_enabler.mm

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#import "base/mac/scoped_nsexception_enabler.h"
-
-#import "base/lazy_instance.h"
-#import "base/threading/thread_local.h"
-
-// To make the |g_exceptionsAllowed| declaration readable.
-using base::LazyInstance;
-using base::ThreadLocalBoolean;
-
-// When C++ exceptions are disabled, the C++ library defines |try| and
-// |catch| so as to allow exception-expecting C++ code to build properly when
-// language support for exceptions is not present.  These macros interfere
-// with the use of |@try| and |@catch| in Objective-C files such as this one.
-// Undefine these macros here, after everything has been #included, since
-// there will be no C++ uses and only Objective-C uses from this point on.
-#undef try
-#undef catch
-
-namespace {
-
-// Whether to allow NSExceptions to be raised on the current thread.
-LazyInstance<ThreadLocalBoolean>::Leaky
-    g_exceptionsAllowed = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-namespace base {
-namespace mac {
-
-bool GetNSExceptionsAllowed() {
-  return g_exceptionsAllowed.Get().Get();
-}
-
-void SetNSExceptionsAllowed(bool allowed) {
-  return g_exceptionsAllowed.Get().Set(allowed);
-}
-
-id RunBlockIgnoringExceptions(BlockReturningId block) {
-  id ret = nil;
-  @try {
-    base::mac::ScopedNSExceptionEnabler enable;
-    ret = block();
-  }
-  @catch(id exception) {
-  }
-  return ret;
-}
-
-ScopedNSExceptionEnabler::ScopedNSExceptionEnabler() {
-  was_enabled_ = GetNSExceptionsAllowed();
-  SetNSExceptionsAllowed(true);
-}
-
-ScopedNSExceptionEnabler::~ScopedNSExceptionEnabler() {
-  SetNSExceptionsAllowed(was_enabled_);
-}
-
-}  // namespace mac
-}  // namespace base