Fix ImportantFileWriter leaking a .tmp file when passed an invalid path

base/files/important_file_writer.cc

Index: base/files/important_file_writer.cc
diff --git a/base/files/important_file_writer.cc b/base/files/important_file_writer.cc
index cc0a616c5be7e5e09e5235a9f658de6c3e70d740..b46846277b0bbde35d6196b39a6f16a33045b560 100644
--- a/base/files/important_file_writer.cc
+++ b/base/files/important_file_writer.cc
@@ -103,6 +103,7 @@ bool ImportantFileWriter::WriteFileAtomically(const FilePath& path,
   File tmp_file(tmp_file_path, File::FLAG_OPEN | File::FLAG_WRITE);
   if (!tmp_file.IsValid()) {
     LogFailure(path, FAILED_OPENING, "could not open temporary file");
+    DeleteFile(tmp_file_path, false);
     return false;
   }