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A new version of Clang made the -Wshadow warning also apply to
enumerators, warning that the blink::WebSettings::V8CacheOptions
enumerators shadow the enumerators from blink::V8CacheOptions, e.g.

49344/58815] CXX obj/third_party/blink/renderer/core/core_generated/v8_code_cache.o
In file included from
../../third_party/blink/renderer/bindings/core/v8/v8_code_cache.cc:9:
../../third_party/blink/public/web/web_settings.h:66:5: warning: declaration
shadows a variable in namespace 'blink' [-Wshadow]
    kV8CacheOptionsDefault,
    ^
../../third_party/blink/renderer/bindings/core/v8/v8_cache_options.h:37:3:
note: previous declaration is here
  kV8CacheOptionsDefault,  // Use whatever the current default is.
  ^

Bug: 895475
Change-Id: I6de82855f3db4655c1bfaa4bb8d77fab1466188e
Reviewed-on: https://chromium-review.googlesource.com/c/1282445Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599974}