[Blink API/IPC] Fix definition of WebTriggeringEventInfo

klast should be set to the value of the largest enumerator, not one
larger. Rename it to kMaxValue as well so clang can automatically
enforce this.

Bug: 482580
Change-Id: Ia37ffb8bb55331f55a74832e42d146669b32e059
Reviewed-on: https://chromium-review.googlesource.com/1097584Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566564}

content/common/frame_messages.h

@@ -137,7 +137,7 @@ IPC_ENUM_TRAITS_MAX_VALUE(blink::mojom::FeaturePolicyFeature,
 IPC_ENUM_TRAITS_MAX_VALUE(content::CSPDisposition,
                           content::CSPDisposition::LAST)
 IPC_ENUM_TRAITS_MAX_VALUE(blink::WebTriggeringEventInfo,
-                          blink::WebTriggeringEventInfo::kLast)
+                          blink::WebTriggeringEventInfo::kMaxValue)
 IPC_ENUM_TRAITS_MAX_VALUE(blink::UserActivationUpdateType,
                           blink::UserActivationUpdateType::kMaxValue)
 

third_party/blink/public/web/web_triggering_event_info.h

@@ -21,7 +21,7 @@ enum class WebTriggeringEventInfo {
   // The navigation was triggered via a JS event with isTrusted() == false.
   kFromUntrustedEvent,
 
-  kLast,
+  kMaxValue = kFromUntrustedEvent,
 };
 
 }  // namespace blink