Remove GYP annotations from third_party GN files.

third_party/WebKit/Source/bindings/scripts/BUILD.gn

Index: third_party/WebKit/Source/bindings/scripts/BUILD.gn
diff --git a/third_party/WebKit/Source/bindings/scripts/BUILD.gn b/third_party/WebKit/Source/bindings/scripts/BUILD.gn
index 3d09601bf851bfc89144162240449e63e15c93a3..ce595a8d4474d90c5367e38827edf77dd906dd82 100644
--- a/third_party/WebKit/Source/bindings/scripts/BUILD.gn
+++ b/third_party/WebKit/Source/bindings/scripts/BUILD.gn
@@ -14,8 +14,6 @@ visibility = [ "//third_party/WebKit/*" ]
 # been run to update it.
 #
 # This action's dependencies *is* the cache validation.
-#
-# GYP version: scripts.gyp:cached_lex_yacc_tables
 action("cached_lex_yacc_tables") {
   script = "blink_idl_parser.py"
 
@@ -31,8 +29,6 @@ action("cached_lex_yacc_tables") {
 # A separate pre-caching step is *required* to use bytecode caching in
 # Jinja (which improves speed significantly), as the bytecode cache is
 # not concurrency-safe on write; details in code_generator_v8.py.
-#
-# GYP version: scripts.gyp:cached_jinja_templates
 action("cached_jinja_templates") {
   script = "code_generator_v8.py"