shortcut_viewer: Undocument Alt variants of Pg{Up,Down} shortcuts.

This is consistent with the other Alt shortcuts for which we also
have Search shortcuts (Home, End, Bksp) and will aid in the possible
future deprecation/removal of the Alt shortcuts.

Bug: 1090186
Change-Id: Ifce1a066fb5bd5b27850625f759bbf815042147c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227052
Auto-Submit: Peter Collingbourne <pcc@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774403}

ash/shortcut_viewer/keyboard_shortcut_viewer_metadata.cc

@@ -772,20 +772,20 @@ const std::vector<KeyboardShortcutItem>& GetKeyboardShortcutItemList() {
       {// |categories|
        {ShortcutCategory::kPageAndBrowser},
        IDS_KSV_DESCRIPTION_PAGE_UP,
-       IDS_KSV_SHORTCUT_PAGE_UP,
+       IDS_KSV_SHORTCUT_ONE_MODIFIER_ONE_KEY,
        // |accelerator_ids|
        {},
        // |shortcut_key_codes|
-       {ui::VKEY_LMENU, ui::VKEY_COMMAND, ui::VKEY_UNKNOWN, ui::VKEY_UP}},
+       {ui::VKEY_COMMAND, ui::VKEY_UNKNOWN, ui::VKEY_UP}},
 
       {// |categories|
        {ShortcutCategory::kPageAndBrowser},
        IDS_KSV_DESCRIPTION_PAGE_DOWN,
-       IDS_KSV_SHORTCUT_PAGE_DOWN,
+       IDS_KSV_SHORTCUT_ONE_MODIFIER_ONE_KEY,
        // |accelerator_ids|
        {},
        // |shortcut_key_codes|
-       {ui::VKEY_LMENU, ui::VKEY_COMMAND, ui::VKEY_UNKNOWN, ui::VKEY_DOWN}},
+       {ui::VKEY_COMMAND, ui::VKEY_UNKNOWN, ui::VKEY_DOWN}},
 
       {// |categories|
        {ShortcutCategory::kPageAndBrowser},

ash/shortcut_viewer/shortcut_viewer_strings.grdp

@@ -387,15 +387,9 @@
   <message name="IDS_KSV_DESCRIPTION_PAGE_UP" desc="Description of the command in keyboard shortcut viewer.">
     Page up
   </message>
-  <message name="IDS_KSV_SHORTCUT_PAGE_UP" desc="Human readable version of the keyboard shortcut.">
-    <ph name="alt">$1<ex>Alt</ex></ph> or <ph name="search">$2<ex>Search</ex></ph><ph name="separator">$3<ex>+</ex></ph><ph name="up">$4<ex>v</ex></ph>
-  </message>
   <message name="IDS_KSV_DESCRIPTION_PAGE_DOWN" desc="Description of the command in keyboard shortcut viewer.">
     Page down
   </message>
-  <message name="IDS_KSV_SHORTCUT_PAGE_DOWN" desc="Human readable version of the keyboard shortcut.">
-    <ph name="alt">$1<ex>Alt</ex></ph> or <ph name="search">$2<ex>Search</ex></ph><ph name="separator">$3<ex>+</ex></ph><ph name="down">$4<ex>v</ex></ph>
-  </message>
   <message name="IDS_KSV_DESCRIPTION_SCROLL_DOWN_PAGE" desc="Description of the command in keyboard shortcut viewer.">
     Scroll down the web page
   </message>