[wasm] Remove declared but undefined methods

We should really think about having a static analysis to check for
such errors, and a bot executing it regularly.
This is not the first time I encounter declared functions that are
never defined.

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2561333002
Cr-Commit-Position: refs/heads/master@{#41617}

src/wasm/wasm-objects.h

@@ -43,13 +43,6 @@ class WasmModuleObject : public JSObject {
   DECLARE_CASTS(WasmModuleObject);
 
   WasmCompiledModule* get_compiled_module();
-  wasm::WasmModule* module();
-  int num_functions();
-  bool is_asm_js();
-  int GetAsmWasmSourcePosition(int func_index, int byte_offset);
-  WasmDebugInfo* debug_info();
-  void set_debug_info(WasmDebugInfo* debug_info);
-  MaybeHandle<String> GetFunctionName(Isolate* isolate, int func_index);
 
   static Handle<WasmModuleObject> New(
       Isolate* isolate, Handle<WasmCompiledModule> compiled_module);