[iOS] Reenable TestTypingInTextField perftest.

Bug: 799488
Change-Id: I194be9c4ea34f966b819285b16d38fe9116bedd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719007
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#682231}

ios/chrome/browser/ui/omnibox/omnibox_perftest.mm

@@ -271,8 +271,7 @@ TEST_F(OmniboxPerfTest, TestTypeOneCharInTextField) {
 
 // Measures the amount of time it takes to type in the word "google" one
 // letter at a time.
-// TODO(crbug.com/799488): Re-enable this test.
-TEST_F(OmniboxPerfTest, DISABLED_TestTypingInTextField) {
+TEST_F(OmniboxPerfTest, TestTypingInTextField) {
   OmniboxTextFieldIOS* textField = (OmniboxTextFieldIOS*)FindViewByClass(
       coordinator_.viewController.view, [OmniboxTextFieldIOS class]);
   // The characters to type into the omnibox text field.