Reland "[wasm] [cleanup] Remove unused parameter from SyncValidate""

Accidental revert...

Original change's description:
> [wasm] [cleanup] Remove unused parameter from SyncValidate
> 
> R=​ahaas@chromium.org
> 
> Change-Id: I952c5461ef44d4b01e99390e668bfc0d7f7ba25b
> Reviewed-on: https://chromium-review.googlesource.com/488341
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#44931}

TBR=ahaas@chromium.org,clemensh@chromium.org,v8-reviews@googlegroups.com

Change-Id: I7e57ccec6c58aa61052613c14d2fd7936e3fb6da
Reviewed-on: https://chromium-review.googlesource.com/488366Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44944}

src/wasm/wasm-js.cc

@@ -177,8 +177,7 @@ void WebAssemblyValidate(const v8::FunctionCallbackInfo<v8::Value>& args) {
 
   v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
   if (!thrower.error() &&
-      i::wasm::SyncValidate(reinterpret_cast<i::Isolate*>(isolate), &thrower,
-                            bytes)) {
+      i::wasm::SyncValidate(reinterpret_cast<i::Isolate*>(isolate), bytes)) {
     return_value.Set(v8::True(isolate));
   } else {
     if (thrower.wasm_error()) thrower.Reify();  // Clear error.

src/wasm/wasm-module.cc

@@ -2502,8 +2502,7 @@ Handle<JSArray> wasm::GetCustomSections(Isolate* isolate,
   return array_object;
 }
 
-bool wasm::SyncValidate(Isolate* isolate, ErrorThrower* thrower,
-                        const ModuleWireBytes& bytes) {
+bool wasm::SyncValidate(Isolate* isolate, const ModuleWireBytes& bytes) {
   if (bytes.start() == nullptr || bytes.length() == 0) return false;
   ModuleResult result =
       DecodeWasmModule(isolate, bytes.start(), bytes.end(), true, kWasmOrigin);

src/wasm/wasm-module.h

@@ -449,7 +449,7 @@ void GrowDispatchTables(Isolate* isolate, Handle<FixedArray> dispatch_tables,
 //============================================================================
 //== Compilation and instantiation ===========================================
 //============================================================================
-V8_EXPORT_PRIVATE bool SyncValidate(Isolate* isolate, ErrorThrower* thrower,
+V8_EXPORT_PRIVATE bool SyncValidate(Isolate* isolate,
                                     const ModuleWireBytes& bytes);
 
 V8_EXPORT_PRIVATE MaybeHandle<WasmModuleObject> SyncCompileTranslatedAsmJs(