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diff --git a/externals/breakpad/src/client/windows/common/auto_critical_section.h b/externals/breakpad/src/client/windows/common/auto_critical_section.h
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+++ b/externals/breakpad/src/client/windows/common/auto_critical_section.h
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+// Copyright 2008 Google LLC
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__
+#define CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__
+
+#include <windows.h>
+
+namespace google_breakpad {
+
+// Automatically enters the critical section in the constructor and leaves
+// the critical section in the destructor.
+class AutoCriticalSection {
+ public:
+  // Creates a new instance with the given critical section object
+  // and enters the critical section immediately.
+  explicit AutoCriticalSection(CRITICAL_SECTION* cs) : cs_(cs), taken_(false) {
+    assert(cs_);
+    Acquire();
+  }
+
+  // Destructor: leaves the critical section.
+  ~AutoCriticalSection() {
+    if (taken_) {
+      Release();
+    }
+  }
+
+  // Enters the critical section. Recursive Acquire() calls are not allowed.
+  void Acquire() {
+    assert(!taken_);
+    EnterCriticalSection(cs_);
+    taken_ = true;
+  }
+
+  // Leaves the critical section. The caller should not call Release() unless
+  // the critical seciton has been entered already.
+  void Release() {
+    assert(taken_);
+    taken_ = false;
+    LeaveCriticalSection(cs_);
+  }
+
+ private:
+  // Disable copy ctor and operator=.
+  AutoCriticalSection(const AutoCriticalSection&);
+  AutoCriticalSection& operator=(const AutoCriticalSection&);
+
+  CRITICAL_SECTION* cs_;
+  bool taken_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // CLIENT_WINDOWS_COMMON_AUTO_CRITICAL_SECTION_H__