[Mac, Win] Don't allow blank spaces in profile names in the new avatar bubble.

chrome/browser/ui/views/profiles/profile_chooser_view.cc

Index: chrome/browser/ui/views/profiles/profile_chooser_view.cc
diff --git a/chrome/browser/ui/views/profiles/profile_chooser_view.cc b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
index 781f3f173e2e9863f1691f0435262da732b13868..c143a400327beebdd77a01eee6b214352ca8fb9d 100644
--- a/chrome/browser/ui/views/profiles/profile_chooser_view.cc
+++ b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
@@ -799,6 +799,7 @@ bool ProfileChooserView::HandleKeyEvent(views::Textfield* sender,
       key_event.key_code() == ui::VKEY_TAB) {
     // Pressing Tab/Enter commits the new profile name, unless it's empty.
     base::string16 new_profile_name = name_textfield->text();
+    base::TrimWhitespace(new_profile_name, base::TRIM_ALL, &new_profile_name);
     if (new_profile_name.empty())
       return true;