Move ENABLE_PEPPER_CDMS to a buildflag header.
Removes the global build flag and #define and converts to a buildflag header in
ppapi/features.
A new target "//third_party/widevine/cdm:headers" was added since
widevine_cdm_version.h was unreferenced in the build. Given that this file now
requires //ppapi/features we really need "gn check" to work on it. I made the
existing users of ":version_h" reference this new target which encompasses the
public headers of the widevine CDM.
TBR=jschuh (render_messages.h)
Review-Url: https://codereview.chromium.org/2411433002
Cr-Commit-Position: refs/heads/master@{#424477}
59 files changed
