Unpack extensions inside chrome's directory.

chrome/common/extensions/extension_constants.cc

Index: chrome/common/extensions/extension_constants.cc
diff --git a/chrome/common/extensions/extension_constants.cc b/chrome/common/extensions/extension_constants.cc
index 1db05cb51c9bf5efe1defb127d80e82402521cfe..174701ca4877712fe2ceacf7aeb78254642e54ed 100644
--- a/chrome/common/extensions/extension_constants.cc
+++ b/chrome/common/extensions/extension_constants.cc
@@ -253,3 +253,14 @@ const char* kGalleryDownloadPrefix =
 const char* kMiniGalleryBrowsePrefix = "https://tools.google.com/chrome/";
 const char* kMiniGalleryDownloadPrefix = "https://dl-ssl.google.com/chrome/";
 }
+
+namespace extension_filenames {
+const char* kTempExtensionName = "CRX_INSTALL";
+
+// The file to write our decoded images to, relative to the extension_path.
+const char* kDecodedImagesFilename = "DECODED_IMAGES";
+
+// The file to write our decoded message catalogs to, relative to the
+// extension_path.
+const char* kDecodedMessageCatalogsFilename = "DECODED_MESSAGE_CATALOGS";
+}