[wasm] Improve naming consistency for WASM instances.

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 108 matching lines @@
   bool force_constructor_;
   bool is_strict_;
 
   friend class FrameArrayIterator;
 };
 
 class WasmStackFrame : public StackFrameBase {
  public:
   virtual ~WasmStackFrame() {}
 
-  Handle<Object> GetReceiver() const override { return wasm_obj_; }
+  Handle<Object> GetReceiver() const override { return wasm_instance_; }
   Handle<Object> GetFunction() const override;
 
   Handle<Object> GetFileName() override { return Null(); }
   Handle<Object> GetFunctionName() override;
   Handle<Object> GetScriptNameOrSourceUrl() override { return Null(); }
   Handle<Object> GetMethodName() override { return Null(); }
   Handle<Object> GetTypeName() override { return Null(); }
   Handle<Object> GetEvalOrigin() override { return Null(); }
 
   int GetPosition() const override;
   int GetLineNumber() override { return wasm_func_index_; }
   int GetColumnNumber() override { return -1; }
 
   bool IsNative() override { return false; }
   bool IsToplevel() override { return false; }
   bool IsEval() override { return false; }
   bool IsConstructor() override { return false; }
   bool IsStrict() const override { return false; }
 
   MaybeHandle<String> ToString() override;
 
  protected:
   Handle<Object> Null() const;
 
   Isolate* isolate_;
 
-  Handle<Object> wasm_obj_;
+  Handle<Object> wasm_instance_;
   uint32_t wasm_func_index_;
   Handle<AbstractCode> code_;
   int offset_;
 
  private:
   void FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix);
 
   friend class FrameArrayIterator;
 };
 
@@ skipping 535 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static std::unique_ptr<char[]> GetLocalizedMessage(Isolate* isolate,
                                                      Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_