Add FilePath to base namespace.

content/browser/appcache/chrome_appcache_service.h

Index: content/browser/appcache/chrome_appcache_service.h
diff --git a/content/browser/appcache/chrome_appcache_service.h b/content/browser/appcache/chrome_appcache_service.h
index 24a509cf12a1b997002d6a4b816884abf8669e76..e11f3f9897ac17a2916866c06448cd20cbb497da 100644
--- a/content/browser/appcache/chrome_appcache_service.h
+++ b/content/browser/appcache/chrome_appcache_service.h
@@ -13,7 +13,9 @@
 #include "webkit/appcache/appcache_service.h"
 #include "webkit/quota/special_storage_policy.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace net {
 class URLRequestContextGetter;
@@ -44,7 +46,7 @@ class CONTENT_EXPORT ChromeAppCacheService
   explicit ChromeAppCacheService(quota::QuotaManagerProxy* proxy);
 
   void InitializeOnIOThread(
-      const FilePath& cache_path,  // may be empty to use in-memory structures
+      const base::FilePath& cache_path,  // May be empty to use in-memory structs.
       ResourceContext* resource_context,
       net::URLRequestContextGetter* request_context_getter,
       scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy);
@@ -67,7 +69,7 @@ class CONTENT_EXPORT ChromeAppCacheService
   void DeleteOnCorrectThread() const;
 
   ResourceContext* resource_context_;
-  FilePath cache_path_;
+  base::FilePath cache_path_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeAppCacheService);
 };