Remove no-longer-needed entry from exec_script_whitelist.

No longer needed after https://chromium-review.googlesource.com/c/chromium/src/+/1267596/

Bug: none
Change-Id: I2caabdde712595b68dc70b6d20c101295dd81c42
Reviewed-on: https://chromium-review.googlesource.com/c/1282383Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600002}

.gn

@@ -422,7 +422,6 @@ exec_script_whitelist =
 
       # TODO(dpranke): Get these from the appropriate repos instead.
       "//third_party/catapult/tracing/BUILD.gn",
-      "//third_party/google_input_tools/inputview.gni",
 
       "//tools/grit/grit_rule.gni",