[wasm][asm.js] Turn on asm.js -> WebAssembly by default.

BUG=v8:4203
R=danno@chromium.org,titzer@chromium.org,jochen@chromium.org

Review-Url: https://codereview.chromium.org/2625823006
Cr-Commit-Position: refs/heads/master@{#443289}

content/public/common/content_features.cc

@@ -12,7 +12,7 @@ namespace features {
 // Enables asm.js to WebAssembly V8 backend.
 // http://asmjs.org/spec/latest/
 const base::Feature kAsmJsToWebAssembly{"AsmJsToWebAssembly",
-                                        base::FEATURE_DISABLED_BY_DEFAULT};
+                                        base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables brotli "Accept-Encoding" advertising and "Content-Encoding" support.
 // Brotli format specification: http://www.ietf.org/id/draft-alakuijala-brotli