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

components/crash/app/breakpad_win.cc

Index: components/crash/app/breakpad_win.cc
diff --git a/components/crash/app/breakpad_win.cc b/components/crash/app/breakpad_win.cc
index bee4fab757feb8c6df1bb999d38a92187fe72c8b..05a29ae8b7400aac30cfea3e5583c39f84d4f58b 100644
--- a/components/crash/app/breakpad_win.cc
+++ b/components/crash/app/breakpad_win.cc
@@ -287,6 +287,7 @@ long WINAPI ServiceExceptionFilter(EXCEPTION_POINTERS* info) {
   return EXCEPTION_EXECUTE_HANDLER;
 }
 
+#if !defined(COMPONENT_BUILD)
 // Installed via base::debug::SetCrashKeyReportingFunctions.
 void SetCrashKeyValueForBaseDebug(const base::StringPiece& key,
                                   const base::StringPiece& value) {
@@ -300,6 +301,7 @@ void ClearCrashKeyForBaseDebug(const base::StringPiece& key) {
   DCHECK(CrashKeysWin::keeper());
   CrashKeysWin::keeper()->ClearCrashKeyValue(base::UTF8ToUTF16(key));
 }
+#endif  // !defined(COMPONENT_BUILD)
 
 }  // namespace