Add enable-app-launcher-shim to chrome://flags.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index bde0dd1c28b98c4ac4f85a4e1c735e794f531a80..d0d51097d4f956a5383fc4ae20791c88b8d665a9 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1519,11 +1519,10 @@ const char kPasswordStore[]                 = "password-store";
 #endif  // OS_POSIX
 
 #if defined(OS_MACOSX)
-// Enables the app list OSX .app shim, for showing the app list. Takes an
-// optional argument: --enable-app-list-shim=0 will delete a previously created
-// .app folder for the app list shim. Any other argument, or no argument, will
-// create it.
-extern const char kEnableAppListShim[]      = "enable-app-list-shim";
+// Enables the app list OSX .app shim, for showing the app list. If the flag is
+// not present, Chrome will check if the shim exists at startup, and delete it
+// if it does.
+const char kEnableAppListShim[]             = "enable-app-list-shim";
 
 // Enables the tabs expose feature ( http://crbug.com/50307 ).
 const char kEnableExposeForTabs[]           = "enable-expose-for-tabs";