Remove an obsolete TODO in grit code.

BUG=503643

Change-Id: I41becf134e3aecd20ce51e50571fff880703b348
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611912
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659751}

tools/grit/grit/gather/chrome_scaled_image.py

@@ -103,9 +103,6 @@ class ChromeScaledImage(interface.GathererBase):
     if try_default_layout and 'default' not in layouts:
       layouts.append('default')
 
-    # TODO(tdanderson): Search in descending order of all image scales
-    #                   instead of immediately falling back to 100.
-    #                   See crbug.com/503643.
     scales = [req_scale]
     try_low_res = self.grd_node.FindBooleanAttribute(
         'fallback_to_low_resolution', default=False, skip_self=False)