base: Change auto to not deduce raw pointers.

base/files/file_path_unittest.cc

Index: base/files/file_path_unittest.cc
diff --git a/base/files/file_path_unittest.cc b/base/files/file_path_unittest.cc
index a091e62dd1b4fd7b8c4b2633db41606897d9081b..9f339527f51ef98c968ec2a874e41a0b10e93b69 100644
--- a/base/files/file_path_unittest.cc
+++ b/base/files/file_path_unittest.cc
@@ -1306,7 +1306,7 @@ TEST_F(FilePathTest, GetHFSDecomposedFormWithInvalidInput) {
     FPL("\xf0\x28\x8c\xbc"),
     FPL("\xf0\x28\x8c\x28"),
   };
-  for (const auto& invalid_input : cases) {
+  for (auto* invalid_input : cases) {
     FilePath::StringType observed = FilePath::GetHFSDecomposedForm(
         invalid_input);
     EXPECT_TRUE(observed.empty());