DevTools: trim the leading BOM char when parsing web manifest.

third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js

Index: third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js b/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
index c7ff8142f0953929f649b92c7fcd3f6927a64111..2354b93bb8ac1c9372217fea7050c953c3e7949b 100644
--- a/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
+++ b/third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js
@@ -106,6 +106,9 @@ Resources.AppManifestView = class extends UI.VBox {
     if (!data)
       return;
 
+    if (data.charCodeAt(0) === 0xFEFF)
+      data = data.slice(1);  // Trim the BOM as per https://tools.ietf.org/html/rfc7159#section-8.1.
+
     var parsedManifest = JSON.parse(data);
     this._nameField.textContent = stringProperty('name');
     this._shortNameField.textContent = stringProperty('short_name');