Remove GYP annotations from third_party GN files.

third_party/android_protobuf/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if (current_toolchain == host_toolchain) {
   config("android_protoc_warnings") {
     cflags = [
       "-Wno-null-conversion",
       "-Wno-tautological-undefined-compare",
       "-Wno-unused-function",
       "-Wno-unused-local-typedef",
     ]
   }
 
-  # GYP: //third_party/android_protobuf/android_protobuf.gyp:android_protoc
   executable("android_protoc") {
     configs -= [
       "//build/config/compiler:chromium_code",
 
       # Does not compile with sanitizers.
       "//build/config/sanitizers:default_sanitizer_flags",
     ]
 
     configs += [
       "//build/config/compiler:no_chromium_code",
@@ skipping 113 matching lines @@
       # of dynamic_cast<>, which requires RTTI.
       "GOOGLE_PROTOBUF_NO_RTTI",
       "GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER",
     ]
   }
 }
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 
-  # GYP: //third_party/android_protobuf/android_protobuf.gyp:protobuf_nano_javalib
   android_library("protobuf_nano_javalib") {
     chromium_code = false
     java_files = [
       "src/java/src/device/main/java/com/google/protobuf/nano/android/ParcelableExtendableMessageNano.java",
       "src/java/src/device/main/java/com/google/protobuf/nano/android/ParcelableMessageNano.java",
       "src/java/src/device/main/java/com/google/protobuf/nano/android/ParcelableMessageNanoCreator.java",
       "src/java/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/Extension.java",
       "src/java/src/main/java/com/google/protobuf/nano/FieldArray.java",
       "src/java/src/main/java/com/google/protobuf/nano/FieldData.java",
       "src/java/src/main/java/com/google/protobuf/nano/InternalNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java",
       "src/java/src/main/java/com/google/protobuf/nano/MessageNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java",
       "src/java/src/main/java/com/google/protobuf/nano/UnknownFieldData.java",
       "src/java/src/main/java/com/google/protobuf/nano/WireFormatNano.java",
     ]
   }
 }