clang/win: Fix most -Wunused-function warnings in Chromium code.

components/crash/app/breakpad_win.cc

 // 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.
 
 #include "components/crash/app/breakpad_win.h"
 
 #include <windows.h>
 #include <shellapi.h>
 #include <tchar.h>
 #include <userenv.h>
@@ skipping 269 matching lines @@
 }
 
 // Exception filter for the service process used when breakpad is not enabled.
 // We just display the "Do you want to restart" message and then die
 // (without calling the previous filter).
 long WINAPI ServiceExceptionFilter(EXCEPTION_POINTERS* info) {
   DumpDoneCallback(NULL, NULL, NULL, info, NULL, false);
   return EXCEPTION_EXECUTE_HANDLER;
 }
 
+#if !defined(COMPONENT_BUILD)
 // Installed via base::debug::SetCrashKeyReportingFunctions.
 void SetCrashKeyValueForBaseDebug(const base::StringPiece& key,
                                   const base::StringPiece& value) {
   DCHECK(CrashKeysWin::keeper());
   CrashKeysWin::keeper()->SetCrashKeyValue(base::UTF8ToUTF16(key),
                                            base::UTF8ToUTF16(value));
 }
 
 // Installed via base::debug::SetCrashKeyReportingFunctions.
 void ClearCrashKeyForBaseDebug(const base::StringPiece& key) {
   DCHECK(CrashKeysWin::keeper());
   CrashKeysWin::keeper()->ClearCrashKeyValue(base::UTF8ToUTF16(key));
 }
+#endif  // !defined(COMPONENT_BUILD)
 
 }  // namespace
 
 // NOTE: This function is used by SyzyASAN to annotate crash reports. If you
 // change the name or signature of this function you will break SyzyASAN
 // instrumented releases of Chrome. Please contact syzygy-team@chromium.org
 // before doing so!
 extern "C" void __declspec(dllexport) __cdecl SetCrashKeyValueImpl(
     const wchar_t* key, const wchar_t* value) {
   CrashKeysWin* keeper = CrashKeysWin::keeper();
@@ skipping 421 matching lines @@
 extern "C" void __declspec(dllexport) __cdecl
 UnregisterNonABICompliantCodeRange(void* start) {
   ExceptionHandlerRecord* record =
       reinterpret_cast<ExceptionHandlerRecord*>(start);
 
   CHECK(RtlDeleteFunctionTable(&record->runtime_function));
 }
 #endif
 
 }  // namespace breakpad