Revert of Move ENABLE_PEPPER_CDMS to a buildflag header.

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index a968fd4528ffe87aa7916699bf2a794e036ce879..210c28b623566b08b9afb4cb75443dd471db29e3 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -9,7 +9,6 @@
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
-import("//ppapi/features/features.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/ffmpeg/ffmpeg_options.gni")
@@ -602,13 +601,12 @@
     "//media/base:test_support",
     "//media/base:unittests",
     "//media/test:pipeline_integration_tests",
-    "//ppapi/features",
     "//skia",  # Direct dependency required to inherit config.
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libwebm",
     "//third_party/libyuv",
-    "//third_party/widevine/cdm:headers",
+    "//third_party/widevine/cdm:version_h",
     "//ui/gfx:test_support",
     "//url",
   ]
@@ -731,7 +729,7 @@
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
-    "//third_party/widevine/cdm:headers",
+    "//third_party/widevine/cdm:version_h",
     "//ui/gfx:test_support",
   ]
   if (media_use_ffmpeg) {