Remove FeaturePolicyConfiguration et al. in favor of the new Whitelisting.

This migrates the config_feature_flag implementation over and removes the
old flag (which was not used except to test it). Fare thee well, old flag.

RELNOTES: None.
PiperOrigin-RevId: 165995681
diff --git a/tools/BUILD b/tools/BUILD
index 9f89403..61e9abc 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -28,6 +28,7 @@
         "//tools/osx/crosstool:srcs",
         "//tools/test:srcs",
         "//tools/python:srcs",
+        "//tools/whitelists:srcs",
         "//tools/zip:srcs",
     ],
 )
@@ -56,6 +57,7 @@
         "//tools/test:srcs",
         "//tools/osx/crosstool:srcs",
         "//tools/osx:srcs",
+        "//tools/whitelists:srcs",
         "//tools/zip:srcs",
     ],
 )