remove .gitattributes to prevent automatic CRLF conversions

Added by https://codereview.chromium.org/292313014/ but causes
annoying warnings on Windows. Just don't add CRLFs.

R=jam@chromium.org

Review URL: https://codereview.chromium.org/430043002

.gitattributes

diff --git a/.gitattributes b/.gitattributes
deleted file mode 100644
index 176a458..0000000
--- a/.gitattributes
+++ /dev/null
@@ -1 +0,0 @@
-* text=auto