1. Remove <issue id="KeyboardInaccessibleWidget" severity="ignore"/> from build/android/lint/suppressions.xml
2. Build all
3. Fix resulting errors

Examples:
chrome/android/java/res/layout/data_use_dialog.xml:27 'clickable' attribute found, please also add 'focusable': KeyboardInaccessibleWidget [warning]
        android:clickable="true"                                                                                                                                                 
        ~~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                                                 
chrome/android/java/res/layout/languages_preference.xml:32 'clickable' attribute found, please also add 'focusable': KeyboardInaccessibleWidget [warning]                        
        android:clickable="true"                           
        ~~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                                                 
chrome/android/java/res/layout/search_activity.xml:38 'clickable' attribute found, please also add 'focusable': KeyboardInaccessibleWidget [warning]
            android:clickable="true" >                                                                                                                                           
            ~~~~~~~~~~~~~~~~~~~~~~~~    

Another UX lint finding to be triaged.