Linux: Use FreeDesktop standard in .desktop entries

chrome/installer/linux/common/desktop.template

Index: chrome/installer/linux/common/desktop.template
diff --git a/chrome/installer/linux/common/desktop.template b/chrome/installer/linux/common/desktop.template
index ec802f2cb10da20d8f8e21a465e86426a93e6447..eef7cc4fe01255e74c8c09fb318a0698db369d66 100644
--- a/chrome/installer/linux/common/desktop.template
+++ b/chrome/installer/linux/common/desktop.template
@@ -111,9 +111,9 @@ Icon=@@PACKAGE@@
 Type=Application
 Categories=Network;WebBrowser;
 MimeType=text/html;text/xml;application/xhtml_xml;image/webp;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;
-X-Ayatana-Desktop-Shortcuts=NewWindow;NewIncognito
+Actions=NewWindow;NewPrivateWindow;
 
-[NewWindow Shortcut Group]
+[Desktop Action NewWindow]
 Name=New Window
 Name[am]=አዲስ መስኮት
 Name[ar]=نافذة جديدة
@@ -166,9 +166,9 @@ Name[vi]=Cửa sổ Mới
 Name[zh_CN]=新建窗口
 Name[zh_TW]=開新視窗
 Exec=/usr/bin/@@USR_BIN_SYMLINK_NAME@@
-TargetEnvironment=Unity
+OnlyShowIn=Unity;
 
-[NewIncognito Shortcut Group]
+[Desktop Action NewPrivateWindow]
 Name=New Incognito Window
 Name[ar]=نافذة جديدة للتصفح المتخفي
 Name[bg]=Нов прозорец „инкогнито“
@@ -219,4 +219,4 @@ Name[vi]=Cửa sổ ẩn danh mới
 Name[zh_CN]=新建隐身窗口
 Name[zh_TW]=新增無痕式視窗
 Exec=/usr/bin/@@USR_BIN_SYMLINK_NAME@@ --incognito
-TargetEnvironment=Unity
+OnlyShowIn=Unity;

[Tom (Use chromium acct), 2016/10/14 00:00:01]

Do you know why TargetEnvironment=Unity was originally added?
Can we just remove this?

Also, desktop-file-validate gives warnings for this:
chrome/installer/linux/common/desktop.template: warning: key "OnlyShowIn" in
group "Desktop Action NewWindow" is deprecated
chrome/installer/linux/common/desktop.template: warning: key "OnlyShowIn" in
group "Desktop Action NewPrivateWindow" is deprecated

There were errors before when using TargetEnvironment=Unity

[Lei Zhang, 2016/10/14 01:23:44]

Nope. As I said, the lost some history with the transition into an internal repo
and then back out.
I'd say yes. See the discussion linked from
https://bugs.freedesktop.org/show_bug.cgi?id=66712

[Tom (Use chromium acct), 2016/10/14 01:51:26]

Done.