Move PathExists to base namespace.

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
diff --git a/net/disk_cache/backend_unittest.cc b/net/disk_cache/backend_unittest.cc
index 4f0a2b4e5a21376097d4ec8ff05020e72ce26ccc..0c1cfb6d9e034d434cde4ed1ff1636a50cdd7780 100644
--- a/net/disk_cache/backend_unittest.cc
+++ b/net/disk_cache/backend_unittest.cc
@@ -2954,7 +2954,7 @@ TEST_F(DiskCacheBackendTest, SimpleCacheOpenMissingFile) {
   // Delete one of the files in the entry.
   base::FilePath to_delete_file = cache_path_.AppendASCII(
       disk_cache::simple_util::GetFilenameFromKeyAndIndex(key, 0));
-  EXPECT_TRUE(file_util::PathExists(to_delete_file));
+  EXPECT_TRUE(base::PathExists(to_delete_file));
   EXPECT_TRUE(disk_cache::DeleteCacheFile(to_delete_file));
 
   // Failing to open the entry should delete the rest of these files.
@@ -2965,7 +2965,7 @@ TEST_F(DiskCacheBackendTest, SimpleCacheOpenMissingFile) {
     base::FilePath
         should_be_gone_file(cache_path_.AppendASCII(
             disk_cache::simple_util::GetFilenameFromKeyAndIndex(key, i)));
-    EXPECT_FALSE(file_util::PathExists(should_be_gone_file));
+    EXPECT_FALSE(base::PathExists(should_be_gone_file));
   }
 }