Remove CreateSharedArray declaration

Removing dead code.

Change-Id: Ib477003cddb02441304efcb0400d511d235d07e4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3756381Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Luis Fernando Pardo Sixtos <lpardosixtos@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#81653}

src/init/bootstrapper.cc

@@ -248,8 +248,6 @@ class Genesis {
   Handle<JSFunction> CreateArrayBuffer(Handle<String> name,
                                        ArrayBufferKind array_buffer_kind);
 
-  Handle<JSFunction> CreateSharedArray();
-
   bool InstallABunchOfRandomThings();
   bool InstallExtrasBindings();