Fix IPC bounds checking for SkColorType and SkAlphaType enums

These used the wrong macros, so considered all values as in bounds.

R=dcheng@chromium.org

Bug: 1144462
Change-Id: I3b87aebd2e9a6a21e93a967361f6648ee4c91b6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523494Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825043}

ui/gfx/ipc/skia/gfx_skia_param_traits_macros.h

@@ -13,8 +13,8 @@
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT GFX_SKIA_IPC_EXPORT
 
-IPC_ENUM_TRAITS_VALIDATE(SkColorType, kLastEnum_SkColorType)
-IPC_ENUM_TRAITS_VALIDATE(SkAlphaType, kLastEnum_SkAlphaType)
+IPC_ENUM_TRAITS_MAX_VALUE(SkColorType, kLastEnum_SkColorType)
+IPC_ENUM_TRAITS_MAX_VALUE(SkAlphaType, kLastEnum_SkAlphaType)
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT