Support automatic javascript test registry in gtest when creating WebUI tests.

base/path_service.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/path_service.h"
 
 #ifdef OS_WIN
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 248 matching lines @@
   p = new Provider;
   p->is_static = false;
   p->func = func;
   p->next = path_data->providers;
 #ifndef NDEBUG
   p->key_start = key_start;
   p->key_end = key_end;
 #endif
   path_data->providers = p;
 }
+
+void PathService::UnregisterProvider(ProviderFunc provider) {
+  PathData* path_data = GetPathData();
+  DCHECK(path_data);
+
+  base::AutoLock scoped_lock(path_data->lock);
+
+  for(Provider** p = &path_data->providers; *p; p = &(*p)->next) {
+    if ((*p)->func == provider) {
+      for(int key = (*p)->key_start; key != (*p)->key_end; ++key) {
+        // Removed the computed path from our cache.
+        path_data->cache.erase(key);
+      }
+      *p = (*p)->next;
+      return;
+    }
+  }
+  NOTREACHED();
+}