cocoa browser: bind cmd-opt-l, not cmd-l, for downloads

chrome/browser/global_keyboard_shortcuts_mac.mm

Index: chrome/browser/global_keyboard_shortcuts_mac.mm
diff --git a/chrome/browser/global_keyboard_shortcuts_mac.mm b/chrome/browser/global_keyboard_shortcuts_mac.mm
index 36650530edcf0f23b57585a237f315062bdb2fee..e197c07c39cfc23ce95fb2536f0edefb821ce2c2 100644
--- a/chrome/browser/global_keyboard_shortcuts_mac.mm
+++ b/chrome/browser/global_keyboard_shortcuts_mac.mm
@@ -76,7 +76,7 @@
       {true, false, false, false, kVK_ANSI_9, 0, IDC_SELECT_LAST_TAB},
       {true, false, false, false, kVK_ANSI_Keypad9, 0, IDC_SELECT_LAST_TAB},
       {true, true, false, false, kVK_ANSI_M, 0, IDC_SHOW_AVATAR_MENU},
-      {true, false, false, true, 0, 'l', IDC_SHOW_DOWNLOADS},
+      {true, false, false, true, kVK_ANSI_L, 0, IDC_SHOW_DOWNLOADS},
   };
 
   *num_entries = arraysize(keyboard_shortcuts);
@@ -121,6 +121,9 @@ static bool MatchesEventForKeyboardShortcut(
   // Expects that one of |key_char| or |vkey_code| is 0.
   DCHECK((shortcut.key_char == 0) ^ (shortcut.vkey_code == 0));
   if (shortcut.key_char) {
+    // Shortcuts that have a |key_char| and have |opt_key| set are mistakes,
+    // since |opt_key| is not checked when there is a |key_char|.
+    DCHECK(!shortcut.opt_key);
     // The given shortcut key is to be matched by a keyboard character.
     // In this case we ignore shift and opt (alt) key modifiers, because
     // the character may be generated by a combination with those keys.