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Replace ClipboardFormatType's Equals() function with operator==. This
should be more consistent with how Chrome classes tend to test for
equality.

Also, reorder some equality comparisons per Chromium C++ Style Guide[1]
(foo == 0 vs 0 == foo).

[1]: https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++.md#code-formatting

Change-Id: Ia1089e838af392808116cb08410d66a69ca722ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333572
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Auto-Submit: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794323}