Additional closure compiler flags for ChromeDriver (#8245)

Adding a couple of command line flags to closure compiler while
generating atoms for ChromeDriver:
* --define=goog.NATIVE_ARRAY_PROTOTYPES=false: This flag used to be
  present before migration to Bazel. Its removal caused ChromeDriver
  bugs, such as https://crbug.com/chromedriver/3422 and
  https://crbug.com/chromedriver/3439.
* --use_types_for_optimization=false: Works around closure compiler
  bugs. This used to be added by hand when the ChromeDriver team
  built atoms.

Co-authored-by: David Burns <david.burns@theautomatedtester.co.uk>

javascript/private/fragment.bzl

@@ -74,6 +74,8 @@ def closure_fragment(
         "chrome": [
             "--define=goog.userAgent.ASSUME_WEBKIT=true",
             "--define=goog.userAgent.product.ASSUME_CHROME=true",
+            "--define=goog.NATIVE_ARRAY_PROTOTYPES=false",
+            "--use_types_for_optimization=false",
         ],
         "ie": [
             "--define=goog.userAgent.ASSUME_IE=true",