[Autofill Assistant] Remove char limit for AA prefs.

There was a request by our translators to increase the char limit.
According to #32 in the linked bug, removing this char limit should be
ok because line wrapping in ChromeBasePreference is supported.

Bug: b/173131782
Change-Id: Ife1e915e5a7a15a09f6dc354c527a067969bce13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554570
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Auto-Submit: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#830155}

chrome/browser/ui/android/strings/android_chrome_strings.grd

@@ -3985,13 +3985,13 @@ Data from your Incognito session will only be cleared from Chrome when you <ph n
       <message name="IDS_PREFS_WEB_ASSISTANCE_SECTION_TITLE" desc="Title for the web assistance section">
         Web Assistance
       </message>
-      <message name="IDS_PREFS_AUTOFILL_ASSISTANT_GET_HELP_TITLE" desc="Title for the switch toggling whether Autofill Assistant is enabled. [CHAR-LIMIT=32]">
+      <message name="IDS_PREFS_AUTOFILL_ASSISTANT_GET_HELP_TITLE" desc="Title for the switch toggling whether Autofill Assistant is enabled.">
         Get help with tasks on the web
       </message>
       <message name="IDS_PREFS_AUTOFILL_ASSISTANT_GET_HELP_SUMMARY" desc="Description for the Autofill Assistant toggle.">
         To help you complete tasks, Google will receive the URLs and contents of sites on which you use Assistant, as well as information you submit through Assistant
       </message>
-      <message name="IDS_PREFS_AUTOFILL_ASSISTANT_PROACTIVE_HELP_TITLE" desc="Title for the switch toggling whether proactive help is enabled. When turned on, the Assistant will be able to proactively show up (without explicit user prompt) and offer to help. [CHAR-LIMIT=32]">
+      <message name="IDS_PREFS_AUTOFILL_ASSISTANT_PROACTIVE_HELP_TITLE" desc="Title for the switch toggling whether proactive help is enabled. When turned on, the Assistant will be able to proactively show up (without explicit user prompt) and offer to help.">
         Proactive Help
       </message>
       <message name="IDS_PREFS_AUTOFILL_ASSISTANT_PROACTIVE_HELP_SUMMARY" desc="Description for the proactive help toggle. It explains that the Assistant may appear proactively when it detects that it can help the user. ">