media: ClearKeyCdm: guard FFmpegVideoDecoder with ENABLE_FFMPEG_VIDEO…

…_DECODERS

FFmpegVideoDecoder is only available if the ENABLE_FFMPEG_VIDEO_DECODERS
buildflag is set, not ENABLE_FFMPEG.

Switch to guarding FFmpegVideoDecoder in ClearKeyCdm to be consistent
with uses of FFmpegVideoDecoder in other places.

R=xhwang@chromium.org

Test: build clear_key_cdm
Bug: None
Change-Id: I2786f3a70282d4e8b3c32ab33e8112649d4a18db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231845
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#777009}

media/cdm/library_cdm/clear_key_cdm/cdm_video_decoder.cc

@@ -42,7 +42,7 @@
 #include "media/filters/dav1d_video_decoder.h"
 #endif
 
-#if BUILDFLAG(ENABLE_FFMPEG)
+#if BUILDFLAG(ENABLE_FFMPEG_VIDEO_DECODERS)
 #include "media/filters/ffmpeg_video_decoder.h"
 #endif
 
@@ -326,7 +326,7 @@ std::unique_ptr<CdmVideoDecoder> CreateVideoDecoder(
 #endif
   }
 
-#if BUILDFLAG(ENABLE_FFMPEG)
+#if BUILDFLAG(ENABLE_FFMPEG_VIDEO_DECODERS)
   if (!video_decoder)
     video_decoder.reset(new FFmpegVideoDecoder(null_media_log.get()));
 #endif