Ignore non-ASCII headers in the mimeHandlerPrivate API.

chrome/test/data/extensions/api_test/mime_handler_view/embedded.js

Index: chrome/test/data/extensions/api_test/mime_handler_view/embedded.js
diff --git a/chrome/test/data/extensions/api_test/mime_handler_view/embedded.js b/chrome/test/data/extensions/api_test/mime_handler_view/embedded.js
index 7341521355693c9d2cc18bd0b347e6fb8485c0a5..16b234577fb67cf752df60106b7b888e5435989c 100644
--- a/chrome/test/data/extensions/api_test/mime_handler_view/embedded.js
+++ b/chrome/test/data/extensions/api_test/mime_handler_view/embedded.js
@@ -86,6 +86,15 @@ var tests = [
     });
   },
 
+  function testNonAsciiHeaders() {
+    checkStreamDetails('testNonAsciiHeaders.csv', false);
+    chrome.test.assertEq(undefined,
+                         streamDetails.responseHeaders['Content-Disposition']);
+    chrome.test.assertEq(undefined,
+                         streamDetails.responseHeaders['ü']);
+    chrome.test.succeed();
+  },
+
   function testPostMessage() {
     var expectedMessages = ['hey', 100, 25.0];
     var messagesReceived = 0;