Remove base/mac/scoped_nsexception_enabler.h.

base/mac/scoped_nsexception_enabler.h

-// Copyright (c) 2011 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.
-
-#ifndef BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_
-#define BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_
-
-#import <Foundation/Foundation.h>
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-
-namespace base {
-namespace mac {
-
-// BrowserCrApplication attempts to restrict throwing of NSExceptions
-// because they interact badly with C++ scoping rules.  Unfortunately,
-// there are some cases where exceptions must be supported, such as
-// when third-party printer drivers are used.  These helpers can be
-// used to enable exceptions for narrow windows.
-
-// Make it easy to safely allow NSException to be thrown in a limited
-// scope.  Note that if an exception is thrown, then this object will
-// not be appropriately destructed!  If the exception ends up in the
-// top-level event loop, things are cleared in -reportException:.  If
-// the exception is caught at a lower level, a higher level scoper
-// should eventually reset things.
-class BASE_EXPORT ScopedNSExceptionEnabler {
- public:
-  ScopedNSExceptionEnabler();
-  ~ScopedNSExceptionEnabler();
-
- private:
-  bool was_enabled_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedNSExceptionEnabler);
-};
-
-// Access the exception setting for the current thread.  This is for
-// the support code in BrowserCrApplication, other code should use
-// the scoper.
-BASE_EXPORT bool GetNSExceptionsAllowed();
-BASE_EXPORT void SetNSExceptionsAllowed(bool allowed);
-
-// Executes |block| with fatal-exceptions turned off, and returns the
-// result.  If an exception is thrown during the perform, nil is
-// returned.
-typedef id (^BlockReturningId)();
-BASE_EXPORT id RunBlockIgnoringExceptions(BlockReturningId block);
-
-}  // namespace mac
-}  // namespace base
-
-#endif  // BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_