Don't allow creating a profile with an empty name in chrome://settings

This is something I missed in https://codereview.chromium.org/532023003

BUG=413116
TEST=Go to chrome://settings and create a new profile. You should not be
able to save a name that's all spaces.

Review URL: https://codereview.chromium.org/562233002

Cr-Commit-Position: refs/heads/master@{#295064}

chrome/browser/resources/options/manage_profile_overlay.html

@@ -86,7 +86,7 @@
           <span id="create-profile-name-label" for="create-profile-name"
               i18n-content="manageProfilesNameLabel">
           </span>
-          <input id="create-profile-name" type="text" required>
+          <input id="create-profile-name" type="text" pattern=".*\S.*" required>
         </label>
       </div>
     </div>

chrome/browser/ui/webui/options/create_profile_handler.cc

@@ -82,6 +82,7 @@ void CreateProfileHandler::CreateProfile(const base::ListValue* args) {
   bool supervised_user = false;
   if (args->GetString(0, &name) && args->GetString(1, &icon)) {
     base::TrimWhitespace(name, base::TRIM_ALL, &name);
+    CHECK(!name.empty());
     if (args->GetBoolean(2, &create_shortcut)) {
       bool success = args->GetBoolean(3, &supervised_user);
       DCHECK(success);

chrome/browser/ui/webui/options/manage_profile_handler.cc

@@ -383,6 +383,7 @@ void ManageProfileHandler::SetProfileIconAndName(const base::ListValue* args) {
     return;
 
   base::TrimWhitespace(new_profile_name, base::TRIM_ALL, &new_profile_name);
+  CHECK(!new_profile_name.empty());
   profiles::UpdateProfileName(profile, new_profile_name);
 }