search: Remove in:all token from suggestions.

frontend_tests/node_tests/search_suggestion.js

@@ -384,7 +384,6 @@ init();
 
     var expected = [
         "",
-        "in:all",
         "is:private",
         "is:starred",
         "is:mentioned",
@@ -400,7 +399,6 @@ init();
     function describe(q) {
         return suggestions.lookup_table[q].description;
     }
-    assert.equal(describe('in:all'), 'All messages');
     assert.equal(describe('is:private'), 'Private messages');
     assert.equal(describe('is:starred'), 'Starred messages');
     assert.equal(describe('is:mentioned'), '@-mentions');

static/js/search_suggestion.js

@@ -344,16 +344,6 @@ function get_operator_subset_suggestions(operators) {
 
 function get_special_filter_suggestions(last, operators) {
     var suggestions = [
-        {
-            search_string: 'in:all',
-            description: 'all messages',
-            invalid: [
-                {operator: 'in'},
-                {operator: 'stream'},
-                {operator: 'pm-with'},
-                {operator: 'is', operand: 'private'},
-            ],
-        },
         {
             search_string: 'is:private',
             description: 'private messages',