Moved Linux specific shell integration declarations into own header.

chrome/browser/web_applications/web_app_linux.cc

Index: chrome/browser/web_applications/web_app_linux.cc
diff --git a/chrome/browser/web_applications/web_app_linux.cc b/chrome/browser/web_applications/web_app_linux.cc
index 4bfb301a1120e4b20bfb720489cb007512be3fac..85efd43271a5e502282c7342056c8d816bbafd45 100644
--- a/chrome/browser/web_applications/web_app_linux.cc
+++ b/chrome/browser/web_applications/web_app_linux.cc
@@ -21,8 +21,8 @@ bool CreatePlatformShortcut(
   scoped_ptr<base::Environment> env(base::Environment::Create());
 
   std::string shortcut_template;
-  if (!ShellIntegration::GetDesktopShortcutTemplate(env.get(),
-                                                    &shortcut_template)) {
+  if (!ShellIntegrationLinux::GetDesktopShortcutTemplate(env.get(),
+                                                         &shortcut_template)) {
     return false;
   }
   return ShellIntegrationLinux::CreateDesktopShortcutForChromeApp(