Remove DumpWithoutCrashing() from extension_prefs

chrome/app/chrome_crash_reporter_client_win.cc

Index: chrome/app/chrome_crash_reporter_client_win.cc
diff --git a/chrome/app/chrome_crash_reporter_client_win.cc b/chrome/app/chrome_crash_reporter_client_win.cc
index 8f5211e4812eb9c00dd304deada978ef5e2b5be1..f4beebdc71d824ab3e464b196f28b4d9bd1f10f6 100644
--- a/chrome/app/chrome_crash_reporter_client_win.cc
+++ b/chrome/app/chrome_crash_reporter_client_win.cc
@@ -190,9 +190,6 @@ size_t RegisterCrashKeysHelper() {
       {"postmessage_dst_url", kLargeSize},
       {"postmessage_script_info", kLargeSize},
 
-      // Temporary for https://crbug.com/616149.
-      {"existing_extension_pref_value_type", crash_keys::kSmallSize},
-
       // Temporary for https://crbug.com/668633.
       {"swdh_set_hosted_version_worker_pid", crash_keys::kSmallSize},
       {"swdh_set_hosted_version_host_pid", crash_keys::kSmallSize},