Remove GN GYP generator.

tools/gn/secondary/crypto/BUILD.gn

Index: tools/gn/secondary/crypto/BUILD.gn
diff --git a/tools/gn/secondary/crypto/BUILD.gn b/tools/gn/secondary/crypto/BUILD.gn
index 2ce5b38db2a43de60c0fec250047e583d7d53498..b9ea117b9aeb4be0266ae597bbb469f4d7ef4ea1 100644
--- a/tools/gn/secondary/crypto/BUILD.gn
+++ b/tools/gn/secondary/crypto/BUILD.gn
@@ -17,7 +17,6 @@ crypto_minimal_sources = [
 ]
 
 component("crypto") {
-  external = true
   output_name = "crcrypto"  # Avoid colliding with OpenSSL's libcrypto.
   sources = [
     "apple_keychain.h",
@@ -186,7 +185,6 @@ component("crypto") {
 # A minimal crypto subset for core features that small standalone targets can
 # use to reduce code size.
 static_library("crypto_minimal") {
-  external = true
   sources = crypto_minimal_sources
 
   deps = [
@@ -198,7 +196,6 @@ static_library("crypto_minimal") {
 }
 
 test("crypto_unittests") {
-  external = true
   sources = [
     # Tests.
     "curve25519_unittest.cc",