Revert "[cleanup] Reland: Remove deprecated functions"

This reverts commit c8376b00.

Reason for revert: Still borked: https://ci.chromium.org/p/chromium/builders/luci.chromium.try/cast_shell_linux/114796

Original change's description:
> [cleanup] Reland: Remove deprecated functions
> 
> This is reland of https://chromium-review.googlesource.com/c/v8/v8/+/1154915
> with no changes since the break in chromium for ChromeOS is now fixed.
> 
> Removes all V8_DEPRECATED functions that weren't recently marked as well
> any V8_DEPRECATE_SOON function that relied on using using the address of
> an object to get hold of the Isolate.
> 
> Bug: v8:7786
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng;luci.chromium.try:linux-chromeos-dbg;luci.chromium.try:linux-chromeos-rel
> Change-Id: Ib62d38b9201fd0dab719948cb5ae5a0a164f7013
> Reviewed-on: https://chromium-review.googlesource.com/1172350
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55119}

TBR=yangguo@chromium.org,delphick@chromium.org

Change-Id: Id1308a694092acfc90a3e7183d66c002feb63999
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7786
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng;luci.chromium.try:linux-chromeos-dbg;luci.chromium.try:linux-chromeos-rel
Reviewed-on: https://chromium-review.googlesource.com/1174751Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55127}

src/isolate.cc

@@ -2223,6 +2223,14 @@ bool Isolate::AreWasmThreadsEnabled(Handle<Context> context) {
   return FLAG_experimental_wasm_threads;
 }
 
+Handle<Context> Isolate::GetCallingNativeContext() {
+  JavaScriptFrameIterator it(this);
+  if (it.done()) return Handle<Context>::null();
+  JavaScriptFrame* frame = it.frame();
+  Context* context = Context::cast(frame->context());
+  return Handle<Context>(context->native_context(), this);
+}
+
 Handle<Context> Isolate::GetIncumbentContext() {
   JavaScriptFrameIterator it(this);
 

src/isolate.h

@@ -958,6 +958,10 @@ class Isolate : private HiddenFactory {
   inline Handle<Context> native_context();
   inline Context* raw_native_context();
 
+  // Returns the native context of the calling JavaScript code.  That
+  // is, the native context of the top-most JavaScript frame.
+  Handle<Context> GetCallingNativeContext();
+
   Handle<Context> GetIncumbentContext();
 
   void RegisterTryCatchHandler(v8::TryCatch* that);
@@ -1873,6 +1877,9 @@ class Isolate : private HiddenFactory {
   friend class v8::Locker;
   friend class v8::SnapshotCreator;
   friend class v8::Unlocker;
+  friend v8::StartupData v8::V8::CreateSnapshotDataBlob(const char*);
+  friend v8::StartupData v8::V8::WarmUpSnapshotDataBlob(v8::StartupData,
+                                                        const char*);
 
   DISALLOW_COPY_AND_ASSIGN(Isolate);
 };