[Sync] Convert sync to a static library.

components/sync/base/cancelation_signal.h

 // Copyright 2013 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 COMPONENTS_SYNC_BASE_CANCELATION_SIGNAL_H_
 #define COMPONENTS_SYNC_BASE_CANCELATION_SIGNAL_H_
 
 #include "base/synchronization/lock.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
 class CancelationObserver;
 
 // This class is used to allow one thread to request that another abort and
 // return early.
 //
 // The signalling thread owns this class and my call Signal() at any time.
 // After that call, this class' IsSignalled() will always return true.  The
 // intended use case is that the task intending to support early exit will
 // periodically check the value of IsSignalled() to see if it should return
 // early.
 //
 // The receiving task may also choose to register an CancelationObserver whose
 // OnSignalReceived() method will be executed on the signaller's thread when
 // Signal() is called.  This may be used for sending an early Signal() to a
 // WaitableEvent.  The registration of the handler is necessarily racy.  If
 // Signal() is executes before TryRegisterHandler(), TryRegisterHandler() will
 // not perform any registration and return false.  That function's caller must
 // handle this case.
 //
 // This class supports only one handler, though it could easily support multiple
 // observers if we found a use case for such a feature.
-class SYNC_EXPORT CancelationSignal {
+class CancelationSignal {
  public:
   CancelationSignal();
   ~CancelationSignal();
 
   // Tries to register a handler to be invoked when Signal() is called.
   //
   // If Signal() has already been called, returns false without registering
   // the handler.  Returns true when the registration is successful.
   //
   // If the registration was successful, the handler must be unregistered with
@@ skipping 18 matching lines @@
   // True if Signal() has been invoked.
   bool signalled_;
 
   // The registered abort handler.  May be NULL.
   CancelationObserver* handler_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_CANCELATION_SIGNAL_H_