Fix a test failure as GetFileSize() will not set the size if it fails

base/file_util_unittest.cc

Index: base/file_util_unittest.cc
diff --git a/base/file_util_unittest.cc b/base/file_util_unittest.cc
index 3594749b4b1fe7c8ff6f73c4d79c9fba641d028d..06843fae4acf7581b09553deb51368001d27172b 100644
--- a/base/file_util_unittest.cc
+++ b/base/file_util_unittest.cc
@@ -2360,8 +2360,7 @@ TEST_F(FileUtilTest, NonExistentContentUriTest) {
   EXPECT_FALSE(base::PathExists(path));
   // Size should be smaller than 0.
   int64 size;
-  file_util::GetFileSize(path, &size);
-  EXPECT_GT(0, size);
+  EXPECT_FALSE(file_util::GetFileSize(path, &size));
 
   // We should not be able to read the file.
   int fd = base::OpenContentUriForRead(path);