Update from chromium https://crrev.com/301725/

net/test/run_all_unittests.cc

Index: net/test/run_all_unittests.cc
diff --git a/net/test/run_all_unittests.cc b/net/test/run_all_unittests.cc
index a035057ded8aad961971479f4627fd2377dc06f6..12df717affb477a987dfff98e7c0a569921bb3a0 100644
--- a/net/test/run_all_unittests.cc
+++ b/net/test/run_all_unittests.cc
@@ -23,6 +23,10 @@
 #include "net/proxy/proxy_resolver_v8.h"
 #endif
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif
+
 using net::internal::ClientSocketPoolBaseHelper;
 using net::SpdySession;
 
@@ -57,6 +61,10 @@ int main(int argc, char** argv) {
   // single-threaded.
   net::EnableSSLServerSockets();
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
+
 #if !defined(OS_IOS)
   net::ProxyResolverV8::EnsureIsolateCreated();
 #endif