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

base/path_service.cc

Index: base/path_service.cc
diff --git a/base/path_service.cc b/base/path_service.cc
index e72ae7deff9af69156ab2ed994de7431009ca5d8..4ede8f6f5b1feed90c58fbda9347108083e9d643 100644
--- a/base/path_service.cc
+++ b/base/path_service.cc
@@ -266,3 +266,22 @@ void PathService::RegisterProvider(ProviderFunc func, int key_start,
 #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();
+}