Add PathService::RemoveOverride to clear path overrides.

base/path_service.h

Index: base/path_service.h
diff --git a/base/path_service.h b/base/path_service.h
index e835a1f34e6b4ddd3c4f313145c30c5cc04ad0fb..a39c688a5b3e656fea026c7c50906b8c3980d606 100644
--- a/base/path_service.h
+++ b/base/path_service.h
@@ -46,6 +46,10 @@ class BASE_EXPORT PathService {
                                         const FilePath& path,
                                         bool create);
 
+  // Removes an override for a special directory or file. Returns true if there
+  // was an override to remove or false if none was present.
+  static bool RemoveOverride(int key);
+
   // To extend the set of supported keys, you can register a path provider,
   // which is just a function mirroring PathService::Get.  The ProviderFunc
   // returns false if it cannot provide a non-empty path for the given key.
@@ -61,10 +65,6 @@ class BASE_EXPORT PathService {
   static void RegisterProvider(ProviderFunc provider,
                                int key_start,
                                int key_end);
- private:
-  static bool GetFromCache(int key, FilePath* path);
-  static bool GetFromOverrides(int key, FilePath* path);
-  static void AddToCache(int key, const FilePath& path);
 };
 
 #endif  // BASE_PATH_SERVICE_H_