Revert of purge nss files and dependencies

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 21 matching lines @@
   defines = [ "NO_MAIN_THREAD_WRAPPING" ]
 }
 
 config("openssl_config") {
   defines = [
     "SSL_USE_OPENSSL",
     "HAVE_OPENSSL_SSL_H",
   ]
 }
 
+config("nss_config") {
+  defines = [
+    "SSL_USE_NSS",
+    "HAVE_NSS_SSL_H",
+    "SSL_USE_NSS_RNG",
+  ]
+}
+
 config("ios_config") {
   libs = [
     "CFNetwork.framework",
 
     #"Foundation.framework",  # Already included in //build/config:default_libs.
     "Security.framework",
     "SystemConfiguration.framework",
 
     #"UIKit.framework",  # Already included in //build/config:default_libs.
   ]
@@ skipping 17 matching lines @@
 }
 
 if (is_linux && !build_with_chromium) {
   # Provides the same functionality as the //crypto:platform target, which
   # WebRTC cannot use as we don't sync src/crypto from Chromium.
   group("linux_system_ssl") {
     if (use_openssl) {
       deps = [
         "//third_party/boringssl",
       ]
+    } else {
+      deps = [
+        "//net/third_party/nss/ssl:libssl",
+      ]
+
+      public_configs = [
+        "//net/third_party/nss/ssl:ssl_config",
+        "//third_party/nss:system_nss_no_ssl_config",
+      ]
     }
   }
 }
 
 if (rtc_build_ssl == 0) {
   config("external_ssl_library") {
     assert(rtc_ssl_root != "",
            "You must specify rtc_ssl_root when rtc_build_ssl==0.")
     include_dirs = [ rtc_ssl_root ]
   }
@@ skipping 384 matching lines @@
       "openssl.h",
       "openssladapter.cc",
       "openssladapter.h",
       "openssldigest.cc",
       "openssldigest.h",
       "opensslidentity.cc",
       "opensslidentity.h",
       "opensslstreamadapter.cc",
       "opensslstreamadapter.h",
     ]
+  } else {
+    public_configs += [ ":nss_config" ]
+    if (rtc_build_ssl) {
+      if (build_with_chromium) {
+        deps += [ "//crypto:platform" ]
+      } else {
+        deps += [ "//net/third_party/nss/ssl:libssl" ]
+        if (is_linux) {
+          deps += [ ":linux_system_ssl" ]
+        } else {
+          deps += [
+            "//third_party/nss:nspr",
+            "//third_party/nss:nss",
+          ]
+        }
+      }
+    } else {
+      configs += [ "external_ssl_library" ]
+    }
+    sources += [
+      "nssidentity.cc",
+      "nssidentity.h",
+      "nssstreamadapter.cc",
+      "nssstreamadapter.h",
+    ]
   }
 
   if (is_android) {
     sources += [
       "ifaddrs-android.cc",
       "ifaddrs-android.h",
     ]
 
     libs += [
       "log",
@@ skipping 99 matching lines @@
       "linux.cc",
       "linux.h",
     ]
   }
 
   if (is_nacl) {
     deps += [ "//native_client_sdk/src/libraries/nacl_io" ]
     defines += [ "timezone=_timezone" ]
   }
 }