Removing NSS files and USE_OPENSSL flag

ios/crnet/crnet_environment.mm

Index: ios/crnet/crnet_environment.mm
diff --git a/ios/crnet/crnet_environment.mm b/ios/crnet/crnet_environment.mm
index b564111b6094572c861928c7b957db95a43e6b0a..2cb28428445a39243cfe5e4fc6671177b7873e25 100644
--- a/ios/crnet/crnet_environment.mm
+++ b/ios/crnet/crnet_environment.mm
@@ -154,14 +154,6 @@ void CrNetEnvironment::Initialize() {
   url::Initialize();
   base::CommandLine::Init(0, nullptr);
 
-#if defined(USE_NSS_VERIFIER)
-  // This needs to happen on the main thread. NSPR's initialization sets up its
-  // memory allocator; if this is not done before other threads are created,
-  // this initialization can race to cause accidental free/allocation
-  // mismatches.
-  crypto::EnsureNSPRInit();
-#endif
-
   // Without doing this, StatisticsRecorder::FactoryGet() leaks one histogram
   // per call after the first for a given name.
   base::StatisticsRecorder::Initialize();
@@ -292,9 +284,6 @@ void CrNetEnvironment::Install() {
   proxy_config_service_ = net::ProxyService::CreateSystemProxyConfigService(
       network_io_thread_->task_runner(), nullptr);
 
-#if defined(USE_NSS_VERIFIER)
-  net::SetURLRequestContextForNSSHttpIO(main_context_.get());
-#endif
   main_context_getter_ = new CrNetURLRequestContextGetter(
       main_context_.get(), network_io_thread_->task_runner());
   base::subtle::MemoryBarrier();
@@ -312,9 +301,6 @@ void CrNetEnvironment::InstallIntoSessionConfiguration(
 
 CrNetEnvironment::~CrNetEnvironment() {
   net::HTTPProtocolHandlerDelegate::SetInstance(nullptr);
-#if defined(USE_NSS_VERIFIER)
-  net::SetURLRequestContextForNSSHttpIO(nullptr);
-#endif
 }
 
 net::URLRequestContextGetter* CrNetEnvironment::GetMainContextGetter() {