Flip the default for the cookie prompt to disabled.

chrome/common/chrome_switches.h

Index: chrome/common/chrome_switches.h
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index 8f0f38e470c2ddbceb98cfbab3cc0c83f9852574..573e6bb665d71cfa0ae128ddb86f6709873f7487 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -49,7 +49,6 @@ extern const char kDisableAudio[];
 extern const char kDisableAuthNegotiateCnameLookup[];
 extern const char kDisableBackingStoreLimit[];
 extern const char kDisableByteRangeSupport[];
-extern const char kDisableCookiePrompt[];
 extern const char kDisableCustomJumpList[];
 extern const char kDisableDatabases[];
 extern const char kDisableDesktopNotifications[];
@@ -102,6 +101,7 @@ extern const char kEnableChromoting[];
 extern const char kEnableClickToPlay[];
 extern const char kEnableCloudPrintProxy[];
 extern const char kEnableCloudPrint[];
+extern const char kEnableCookiePrompt[];
 extern const char kEnableDeviceOrientation[];
 extern const char kEnableExperimentalExtensionApis[];
 extern const char kEnableExperimentalWebGL[];