Move GetWebstoreLaunchURL and GetWebstoreItemDetailURLPrefix to extensions/common/extension_urls.h.

extensions/common/extension_urls.h

Index: extensions/common/extension_urls.h
diff --git a/extensions/common/extension_urls.h b/extensions/common/extension_urls.h
index 2236a81c307071501c55804392006ae05015704a..56c0f476000c34b6eb3a8d174d00bd9e5495682c 100644
--- a/extensions/common/extension_urls.h
+++ b/extensions/common/extension_urls.h
@@ -21,6 +21,16 @@ extern const char kSchemaUtils[];
 // or internal (e.g., "event_bindings" or "schemaUtils").
 bool IsSourceFromAnExtension(const base::string16& source);
 
+// Returns the URL prefix for the extension/apps gallery. Can be set via the
+// --apps-gallery-url switch. The URL returned will not contain a trailing
+// slash. Do not use this as a prefix/extent for the store.
+std::string GetWebstoreLaunchURL();
+
+// Returns the URL prefix for an item in the extension/app gallery. This URL
+// will contain a trailing slash and should be concatenated with an item ID
+// to get the item detail URL.
+std::string GetWebstoreItemDetailURLPrefix();
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_URLS_H_