[ImportantStorage] Clear button string update and lint fixes.

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 496 matching lines @@
       </message>
       <message name="IDS_CLEAR_BROWSING_DATA_PERIOD_FOUR_WEEKS" desc="The option to delete browsing data from the last 4 weeks. This is the direct object of the sentence 'Clear data from the last 4 weeks'.">
         last 4 weeks
       </message>
       <message name="IDS_CLEAR_BROWSING_DATA_PERIOD_EVERYTHING" desc="The option to delete browsing data from the beginning of time. This is the direct object of the sentence 'Clear data from the beginning of time'.">
         beginning of time
       </message>
       <message name="IDS_CLEAR_BROWSING_DATA_IMPORTANT_DIALOG_TEXT" desc="The text of the dialog presenting the user with 'important' sites that they can exclude from clearing.">
         This will clear data for all sites, including:
       </message>
+      <message name="IDS_CLEAR_BROWSING_DATA_IMPORTANT_DIALOG_BUTTON" desc="The text of the button to perform the clear action in the dialog presenting the user with 'important' sites that they can exclude from clearing.">
+        Clear
+      </message>
 
       <message name="IDS_USAGE_AND_CRASH_REPORTS_TITLE" desc="Title for 'Usage and crash reports' preference">
         Usage and crash reports
       </message>
       <message name="IDS_USAGE_AND_CRASH_REPORTS_DESCRIPTION" desc="Description for 'Usage and crash reports' preference">
         Automatically send usage statistics and crash reports to Google
       </message>
 
       <!-- Accessibility preferences -->
       <message name="IDS_PREFS_ACCESSIBILITY" desc="Title of Accessibility settings, which allows the user to change webpage font sizes. [CHAR-LIMIT=32]">
@@ skipping 2091 matching lines @@
       <!-- Migration strings -->
       <message name="IDS_TAB_SWITCHER_CALLOUT_HEADER" desc="Header for the Tab Switcher callout.">
         Quickly switch tabs
       </message>
       <message name="IDS_TAB_SWITCHER_CALLOUT_BODY" desc="Indicates that clicking the tab switcher button gives you quick access to your tabs.">
         Tap this button for quick access to your tabs.
       </message>
     </messages>
   </release>
 </grit>