Apply automated fixits for Chrome clang plugin to base_unittests.

Working on trimming down ~26k warnings on the Windows clang build.

BUG=467287

Review URL: https://codereview.chromium.org/1092863002

Cr-Commit-Position: refs/heads/master@{#325606}

• base/async_socket_io_handler.h[diff]
• base/file_version_info_win.h[diff]
• base/files/file_path_watcher_win.cc[diff]
• base/logging_win.h[diff]
• base/memory/shared_memory_unittest.cc[diff]
• base/message_loop/message_loop_unittest.cc[diff]
• base/message_loop/message_pump_win.h[diff]
• base/process/kill_win.cc[diff]
• base/sync_socket.h[diff]
• base/synchronization/condition_variable_win.cc[diff]
• base/synchronization/waitable_event_watcher.h[diff]
• base/test/test_reg_util_win_unittest.cc[diff]
• base/trace_event/trace_event_win_unittest.cc[diff]
• base/win/enum_variant.h[diff]
• base/win/event_trace_consumer_unittest.cc[diff]
• base/win/event_trace_controller_unittest.cc[diff]
• base/win/iunknown_impl.h[diff]
• base/win/iunknown_impl_unittest.cc[diff]
• base/win/object_watcher_unittest.cc[diff]
• base/win/pe_image.h[diff]
• base/win/registry.cc[diff]
• base/win/registry_unittest.cc[diff]
• base/win/shortcut_unittest.cc[diff]