Rolling DEPS for text-fragments-polyfill

This should fix the compiler warnings. It also introduces improved logic
for finding text fragments in the page, including support for prefixes
and suffixes.

Bug: 1129390
Change-Id: I67f8cf00f6afa200920fc4bd52634ee7b05d3089
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419573Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808562}

DEPS

@@ -1407,7 +1407,7 @@ deps = {
     Var('swiftshader_git') + '/SwiftShader.git' + '@' +  Var('swiftshader_revision'),
 
   'src/third_party/text-fragments-polyfill/src': {
-    'url': Var('chromium_git') + '/external/github.com/GoogleChromeLabs/text-fragments-polyfill.git' + '@' + '5593fc403e4d1ee06a68ff710932d59c06a87df9',
+    'url': Var('chromium_git') + '/external/github.com/GoogleChromeLabs/text-fragments-polyfill.git' + '@' + '16efd3187052bd875f7a7a8f0b0424f46c82f87f',
     'condition': 'checkout_ios',
   },