[iOS] Roll text-fragments-polyfill to silence unreachable code warning.

Bug: 1136043
Change-Id: I2caa0b769cc08dd071d55336ca9202548f0dc433
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521705
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Commit-Queue: sebsg <sebsg@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Auto-Submit: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824905}

DEPS

@@ -1428,7 +1428,7 @@ 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' + '@' + '8e7110bf0aab9096e1bbad809d233d25b3b70e8f',
+    'url': Var('chromium_git') + '/external/github.com/GoogleChromeLabs/text-fragments-polyfill.git' + '@' + 'b2df6bf7b4dc1665989306a8119eb041f013f567',
     'condition': 'checkout_ios',
   },