Update from chromium https://crrev.com/302282

third_party/boringssl/boringssl.gyp

Index: third_party/boringssl/boringssl.gyp
diff --git a/third_party/boringssl/boringssl.gyp b/third_party/boringssl/boringssl.gyp
index f18e333559570974a3549893157968cf973998e8..c3760c061b015cdc3f5077ef94d65615a50c7aed 100644
--- a/third_party/boringssl/boringssl.gyp
+++ b/third_party/boringssl/boringssl.gyp
@@ -34,7 +34,18 @@
             ['OS == "linux" or OS == "android"', {
               'sources': [ '<@(boringssl_linux_x86_sources)' ],
             }],
-            ['OS != "mac" and OS != "linux" and OS != "android"', {
+            ['OS == "win"', {
+              'sources': [ '<@(boringssl_win_x86_sources)' ],
+              # Win32 is built with Yasm. The other ports use the platform
+              # assembler.
+              'variables': {
+                'yasm_output_path': '<(SHARED_INTERMEDIATE_DIR)/third_party/boringssl',
+              },
+              'includes': [
+                '../yasm/yasm_compile.gypi',
+              ],
+            }],
+            ['OS != "mac" and OS != "linux" and OS != "win" and OS != "android"', {
               'defines': [ 'OPENSSL_NO_ASM' ],
             }],
           ]