clang/win: Fix another -Wunused-local-typedef warning.
clang/win: Fix another -Wunused-local-typedef warning.

Fixes

..\..\chrome/installer/mini_installer/mini_string.h(77,36) :  error: unused typedef 'invalid_buffer_size' [-Werror,-Wunused-local-typedef]
    COMPILE_ASSERT(kCapacity != 0, invalid_buffer_size);
                                   ^
..\..\chrome/installer/mini_installer/mini_string.h(13,41) :  note: expanded from macro 'COMPILE_ASSERT'
    typedef CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
                                        ^

BUG=411648
TBR=robertshield

Review URL: https://codereview.chromium.org/1248483002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#339541}

CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,lihui7115/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend