Make net use v8 through gin

gin/isolate_holder.cc

Index: gin/isolate_holder.cc
diff --git a/gin/isolate_holder.cc b/gin/isolate_holder.cc
index 3bda7f5738da93c7bf03c159cb941a342e77ac31..805ab27482395b6e6b3f63368b03ed6dc1f6139b 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -24,8 +24,8 @@ bool GenerateEntropy(unsigned char* buffer, size_t amount) {
   return true;
 }
 
-
-void EnsureV8Initialized(bool gin_managed) {
+void EnsureV8Initialized(gin::IsolateHolder::ScriptMode mode,
+                         bool gin_managed) {
   static bool v8_is_initialized = false;
   static bool v8_is_gin_managed = false;
   if (v8_is_initialized) {
@@ -39,17 +39,20 @@ void EnsureV8Initialized(bool gin_managed) {
 
   v8::V8::InitializePlatform(V8Platform::Get());
   v8::V8::SetArrayBufferAllocator(ArrayBufferAllocator::SharedInstance());
-  static const char v8_flags[] = "--use_strict --harmony";
-  v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
+  if (mode == gin::IsolateHolder::kStrictMode) {
+    // TODO(jochen): drop --harmony. it's really too unstable and broad to use.
+    static const char v8_flags[] = "--use_strict --harmony";
+    v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
+  }
   v8::V8::SetEntropySource(&GenerateEntropy);
   v8::V8::Initialize();
 }
 
 }  // namespace
 
-IsolateHolder::IsolateHolder()
+IsolateHolder::IsolateHolder(ScriptMode mode)
   : isolate_owner_(true) {
-  EnsureV8Initialized(true);
+  EnsureV8Initialized(mode, true);
   isolate_ = v8::Isolate::New();
   v8::ResourceConstraints constraints;
   constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
@@ -61,7 +64,7 @@ IsolateHolder::IsolateHolder()
 IsolateHolder::IsolateHolder(v8::Isolate* isolate,
                              v8::ArrayBuffer::Allocator* allocator)
     : isolate_owner_(false), isolate_(isolate) {
-  EnsureV8Initialized(false);
+  EnsureV8Initialized(kNonStrictMode, false);
   Init(allocator);
 }