Increase length of "Suppress Dialogs" string to 25em.

ios/chrome/app/strings/ios_strings.grd

Index: ios/chrome/app/strings/ios_strings.grd
diff --git a/ios/chrome/app/strings/ios_strings.grd b/ios/chrome/app/strings/ios_strings.grd
index e46ed4faa9a65676da74d351e49a6d1afed17362..4c5bf6323672c533a1e48876d5a1e55a1435928f 100644
--- a/ios/chrome/app/strings/ios_strings.grd
+++ b/ios/chrome/app/strings/ios_strings.grd
@@ -709,7 +709,7 @@ To adjust your search term, long press to select. To refine your search, slide t
       <message name="IDS_IOS_ICON_SEARCH" desc="Accessibility label for the search icon [iOS only].">
         Search
       </message>
-      <message name="IDS_IOS_JAVA_SCRIPT_DIALOG_BLOCKING_BUTTON_TEXT" desc="The text used for the button added to JavaScript dialogs to prevent a page from spamming the user with endless alerts. [Length:20em]">
+      <message name="IDS_IOS_JAVA_SCRIPT_DIALOG_BLOCKING_BUTTON_TEXT" desc="The text used for the button added to JavaScript dialogs to prevent a page from spamming the user with endless alerts. [Length:25em]">
         Suppress Dialogs
       </message>
       <message name="IDS_IOS_KEYBOARD_BOOKMARK_THIS_PAGE" desc="In Title Case: Title of the keyboard shortcut that bookmarks the current page. [Length: 20 em] [iOS only]">