Fix BoringSSL build on iOS

In order to get BoringSSL to build on iOS we need to make a couple of initial changes:

* We disable unittests due to the current inability to run new processes on iOS.
* We disable the use of custom assembly since we are unable to build the assembly for the iOS architecture and would otherwise be unable to test it.

BUG=591545

Review URL: https://codereview.chromium.org/1809153002

Cr-Commit-Position: refs/heads/master@{#381812}

third_party/boringssl/BUILD.gn

@@ -82,7 +82,9 @@ if (is_win && !is_msan) {
     if (is_msan) {
       public_configs = [ ":no_asm_config" ]
     } else if (current_cpu == "x64") {
-      if (is_mac || is_ios) {
+      if (is_ios) {
+        defines += [ "OPENSSL_NO_ASM" ]
+      } else if (is_mac) {
         sources += gypi_values.boringssl_mac_x86_64_sources
       } else if (is_linux || is_android) {
         sources += gypi_values.boringssl_linux_x86_64_sources
@@ -90,7 +92,9 @@ if (is_win && !is_msan) {
         public_configs = [ ":no_asm_config" ]
       }
     } else if (current_cpu == "x86") {
-      if (is_mac || is_ios) {
+      if (is_ios) {
+        defines += [ "OPENSSL_NO_ASM" ]
+      } else if (is_mac) {
         sources += gypi_values.boringssl_mac_x86_sources
       } else if (is_linux || is_android) {
         sources += gypi_values.boringssl_linux_x86_sources

third_party/boringssl/boringssl.gyp

@@ -108,7 +108,7 @@
                 '../yasm/yasm_compile.gypi',
               ],
             }],
-            ['OS != "mac" and OS != "ios" and OS != "linux" and OS != "win" and OS != "android"', {
+            ['OS != "mac" and OS != "linux" and OS != "win" and OS != "android"', {
               'direct_dependent_settings': {
                 'defines': [ 'OPENSSL_NO_ASM' ],
               },
@@ -134,7 +134,7 @@
                 '../yasm/yasm_compile.gypi',
               ],
             }],
-            ['OS != "mac" and OS != "ios" and OS != "linux" and OS != "win" and OS != "android"', {
+            ['OS != "mac" and OS != "linux" and OS != "win" and OS != "android"', {
               'direct_dependent_settings': {
                 'defines': [ 'OPENSSL_NO_ASM' ],
               },

third_party/boringssl/boringssl_tests.gyp

@@ -6,6 +6,8 @@
   'includes': [
     'boringssl_tests.gypi',
   ],
+  'conditions': [
+    ['OS!="ios"', {
       'targets': [
         {
           'target_name': 'boringssl_unittests',
@@ -22,4 +24,6 @@
           ],
         },
       ],
+    }],
+  ],
 }