[wasm] [asmjs] Route asm.js warnings to the dev console.

src/asmjs/asm-js.cc

Index: src/asmjs/asm-js.cc
diff --git a/src/asmjs/asm-js.cc b/src/asmjs/asm-js.cc
index 7d00c5fd872542248b5f42b670a05c4e71baa464..af27beef9a2c354d9311127e1076ad6c0119a803 100644
--- a/src/asmjs/asm-js.cc
+++ b/src/asmjs/asm-js.cc
@@ -160,8 +160,9 @@ MaybeHandle<FixedArray> AsmJs::ConvertAsmToWasm(ParseInfo* info) {
   auto asm_wasm_result = builder.Run(&foreign_globals);
   if (!asm_wasm_result.success) {
     DCHECK(!info->isolate()->has_pending_exception());
-    PrintF("Validation of asm.js module failed: %s\n",
-           builder.typer()->error_message());
+    MessageHandler::ReportMessage(info->isolate(),
+                                  builder.typer()->message_location(),
+                                  builder.typer()->error_message());
     return MaybeHandle<FixedArray>();
   }
   wasm::ZoneBuffer* module = asm_wasm_result.module_bytes;