Set active extension IDs for crash reports using the crash key logging system.

base/debug/crash_logging.h

Index: base/debug/crash_logging.h
diff --git a/base/debug/crash_logging.h b/base/debug/crash_logging.h
index 376d0116553acc9cb183200566ad4f7c3b64cbf5..90e6687bec8cdfd50fd629e0fe9e06996c05f6a4 100644
--- a/base/debug/crash_logging.h
+++ b/base/debug/crash_logging.h
@@ -56,7 +56,7 @@ class BASE_EXPORT ScopedCrashKey {
 // Before setting values for a key, all the keys must be registered.
 struct BASE_EXPORT CrashKey {
   // The name of the crash key, used in the above functions.
-  const char* const key_name;
+  const char* key_name;
 
   // The maximum length for a value. If the value is longer than this, it will
   // be truncated. If the value is larger than the |chunk_max_length| passed to