Fix crash by preventing extensions from changing their IDs.

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 91000a5adf68b56400aff2db7aa70b73f6a75147..621fb63f50848f7c5344a1755cb0f3970649c461 100644
--- a/chrome/common/extensions/extension_constants.cc
+++ b/chrome/common/extensions/extension_constants.cc
@@ -144,6 +144,8 @@ const char* kBackgroundPermissionNeeded =
 const char* kCannotAccessPage =
     "Cannot access contents of url \"*\". "
     "Extension manifest must request permission to access this host.";
+const char* kCannotChangeExtensionID =
+    "Installed extensions cannot change their IDs.";
 const char* kCannotClaimAllHostsInExtent =
     "Cannot claim all hosts ('*') in an extent.";
 const char* kCannotClaimAllURLsInExtent =