Remove dependency of chrome in WebRequestPermissions.

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index 880ac1a059bc496b78a413f7dc7792ee84c03df5..8d4122ac78057eb6c9b89aa2dcfa91f907909fdd 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -140,9 +140,6 @@ extern const char kSettingsAppId[];
 // The extension id used for testing streamsPrivate
 extern const char kStreamsPrivateTestExtensionId[];
 
-// The extension id of the Web Store component application.
-extern const char kWebStoreAppId[];
-
 // The extension id of the Youtube application.
 extern const char kYoutubeAppId[];