fuchsia: Fix ImportantFileWriterTest.WriteFileAtomicallyHistogramSuffixTest

Recently added in https://codereview.chromium.org/2920223002/. This test
was trying to test for failure in writing to "bad/../path", which in
FilePath terms is "/path". On most POSIX OS's, this fails because /
tends to not be writable, however Fuchsia's root is virtual so apps (at
least currently) can successfully write there. Change the test path to
"bad/../non_existent/path" so that the non-existence of /non_existent
causes the file creation to fail.

Bug: 706592
Change-Id: I5f8f22e59a0b157a9ec7f8309cc1175e4d9d0a79
Reviewed-on: https://chromium-review.googlesource.com/541677
Reviewed-by: Daniel Cheng <[email protected]>
Commit-Queue: Scott Graham <[email protected]>
Cr-Commit-Position: refs/heads/master@{#480975}
diff --git a/base/files/important_file_writer_unittest.cc b/base/files/important_file_writer_unittest.cc
index e5afedb..a0ef589d 100644
--- a/base/files/important_file_writer_unittest.cc
+++ b/base/files/important_file_writer_unittest.cc
@@ -335,7 +335,7 @@
   histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError", 0);
   histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError.test", 0);
 
-  FilePath invalid_file_ = FilePath().AppendASCII("bad/../path");
+  FilePath invalid_file_ = FilePath().AppendASCII("bad/../non_existent/path");
   EXPECT_FALSE(PathExists(invalid_file_));
   EXPECT_FALSE(
       ImportantFileWriter::WriteFileAtomically(invalid_file_, nullptr));