Fix use of history timers in background threads.

src/compiler/wasm-compiler.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_WASM_COMPILER_H_
 #define V8_COMPILER_WASM_COMPILER_H_
 
 #include <memory>
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
@@ skipping 71 matching lines @@
   int func_index_;
   wasm::Result<wasm::DecodeStruct*> graph_construction_result_;
   bool ok_ = true;
 #if DEBUG
   bool handles_initialized_ = false;
 #endif  // DEBUG
   ZoneVector<trap_handler::ProtectedInstructionData>
       protected_instructions_;  // Instructions that are protected by the signal
                                 // handler.
 
-  void ExecuteCompilationInternal();
-
   DISALLOW_COPY_AND_ASSIGN(WasmCompilationUnit);
 };
 
 // Wraps a JS function, producing a code object that can be called from WASM.
 Handle<Code> CompileWasmToJSWrapper(Isolate* isolate, Handle<JSReceiver> target,
                                     wasm::FunctionSig* sig, uint32_t index,
                                     Handle<String> module_name,
                                     MaybeHandle<String> import_name,
                                     wasm::ModuleOrigin origin);
 
@@ skipping 301 matching lines @@
   }
 
   int AddParameterNodes(Node** args, int pos, int param_count,
                         wasm::FunctionSig* sig);
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_WASM_COMPILER_H_