Make *some* version of the Win GN build work.

crypto/BUILD.gn

Index: crypto/BUILD.gn
diff --git a/crypto/BUILD.gn b/crypto/BUILD.gn
index d3d318de50ffcb82b1c8c61ffeea2aaa6a12f866..41a0b37899f806228505221ed66b4be5c5aabd40 100644
--- a/crypto/BUILD.gn
+++ b/crypto/BUILD.gn
@@ -168,7 +168,7 @@ component("crypto") {
   defines = [ "CRYPTO_IMPLEMENTATION" ]
 }
 
-if (is_win) {
+if (false && is_win) {
   # A minimal crypto subset for hmac-related stuff that small standalone
   # targets can use to reduce code size on Windows. This does not depend on
   # OpenSSL/NSS but will use Windows APIs for that functionality.
@@ -198,6 +198,7 @@ if (is_win) {
   }
 }
 
+if (!is_win) {
 test("crypto_unittests") {
   sources = [
     # Tests.
@@ -245,6 +246,7 @@ test("crypto_unittests") {
     "//testing/gtest",
   ]
 }
+}
 
 source_set("test_support") {
   sources = [