Remove zlib/patches/0003-use-defines-for-inffast.patch

Patch files are no longer needed per the README.chromium guidelines.

Bug: 764431
Change-Id: I7cbfb9e51f74a7499697e6ff541bb02e30572c5b
Reviewed-on: https://chromium-review.googlesource.com/910870Reviewed-by: Chris Blume <cblume@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535919}

third_party/zlib/patches/0003-use-defines-for-inffast.patch

-From 8626f3ea324e1e6f15229722761617063a70b96b Mon Sep 17 00:00:00 2001
-From: Chris Blume <cblume@google.com>
-Date: Tue, 12 Sep 2017 11:17:55 -0700
-Subject: [PATCH 1/1] Zlib: Use defines for inffast
-
-Zlib's inffast uses a handful of magic numbers. It would be easier to
-read and maintain if these magic numbers were instead #defines.
-
-NigelTao@ wrote this code to clean up the magic numbers in
-https://chromium-review.googlesource.com/c/chromium/src/+/601694
-
-Nigel gave me permission to make a separate pull request to separate out
-just the magic number cleaning.
-
-BUG=764431
----
- third_party/zlib/infback.c |  3 ++-
- third_party/zlib/inffast.c | 15 +++++++++------
- third_party/zlib/inffast.h | 15 +++++++++++++++
- third_party/zlib/inflate.c |  3 ++-
- 4 files changed, 28 insertions(+), 8 deletions(-)
-
-diff --git a/third_party/zlib/infback.c b/third_party/zlib/infback.c
-index 59679ecbfc5d..b93ef478e957 100644
---- a/third_party/zlib/infback.c
-+++ b/third_party/zlib/infback.c
-@@ -480,7 +480,8 @@ void FAR *out_desc;
- 
-         case LEN:
-             /* use inflate_fast() if we have enough input and output */
--            if (have >= 6 && left >= 258) {
-+            if (have >= INFLATE_FAST_MIN_HAVE &&
-+                left >= INFLATE_FAST_MIN_LEFT) {
-                 RESTORE();
-                 if (state->whave < state->wsize)
-                     state->whave = state->wsize - left;
-diff --git a/third_party/zlib/inffast.c b/third_party/zlib/inffast.c
-index 0dbd1dbc09f2..66c0d02494a9 100644
---- a/third_party/zlib/inffast.c
-+++ b/third_party/zlib/inffast.c
-@@ -23,8 +23,8 @@
-    Entry assumptions:
- 
-         state->mode == LEN
--        strm->avail_in >= 6
--        strm->avail_out >= 258
-+        strm->avail_in >= INFLATE_FAST_MIN_HAVE
-+        strm->avail_out >= INFLATE_FAST_MIN_LEFT
-         start >= strm->avail_out
-         state->bits < 8
- 
-@@ -80,10 +80,10 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
-     /* copy state to local variables */
-     state = (struct inflate_state FAR *)strm->state;
-     in = strm->next_in;
--    last = in + (strm->avail_in - 5);
-+    last = in + (strm->avail_in - (INFLATE_FAST_MIN_HAVE - 1));
-     out = strm->next_out;
-     beg = out - (start - strm->avail_out);
--    end = out + (strm->avail_out - 257);
-+    end = out + (strm->avail_out - (INFLATE_FAST_MIN_LEFT - 1));
- #ifdef INFLATE_STRICT
-     dmax = state->dmax;
- #endif
-@@ -298,9 +298,12 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
-     /* update state and return */
-     strm->next_in = in;
-     strm->next_out = out;
--    strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
-+    strm->avail_in = (unsigned)(in < last ?
-+        (INFLATE_FAST_MIN_HAVE - 1) + (last - in) :
-+        (INFLATE_FAST_MIN_HAVE - 1) - (in - last));
-     strm->avail_out = (unsigned)(out < end ?
--                                 257 + (end - out) : 257 - (out - end));
-+        (INFLATE_FAST_MIN_LEFT - 1) + (end - out) :
-+        (INFLATE_FAST_MIN_LEFT - 1) - (out - end));
-     state->hold = hold;
-     state->bits = bits;
-     return;
-diff --git a/third_party/zlib/inffast.h b/third_party/zlib/inffast.h
-index e5c1aa4ca8cd..dda6bc82cc3b 100644
---- a/third_party/zlib/inffast.h
-+++ b/third_party/zlib/inffast.h
-@@ -8,4 +8,19 @@
-    subject to change. Applications should only use zlib.h.
-  */
- 
-+
-+/* INFLATE_FAST_MIN_LEFT is the minimum number of output bytes that are left,
-+   so that we can call inflate_fast safely with only one up front bounds check.
-+   One length-distance code pair can copy up to 258 bytes.
-+ */
-+#define INFLATE_FAST_MIN_LEFT 258
-+
-+/* INFLATE_FAST_MIN_HAVE is the minimum number of input bytes that we have, so
-+   that we can call inflate_fast safely with only one up front bounds check.
-+   One length-distance code pair (as two Huffman encoded values of up to 15
-+   bits each) plus any additional bits (up to 5 for length and 13 for distance)
-+   can require reading up to 48 bits, or 6 bytes.
-+ */
-+#define INFLATE_FAST_MIN_HAVE 6
-+
- void ZLIB_INTERNAL inflate_fast OF((z_streamp strm, unsigned start));
-diff --git a/third_party/zlib/inflate.c b/third_party/zlib/inflate.c
-index cc38b983485b..257b9a982668 100644
---- a/third_party/zlib/inflate.c
-+++ b/third_party/zlib/inflate.c
-@@ -1044,7 +1044,8 @@ int flush;
-         case LEN_:
-             state->mode = LEN;
-         case LEN:
--            if (have >= 6 && left >= 258) {
-+            if (have >= INFLATE_FAST_MIN_HAVE &&
-+                left >= INFLATE_FAST_MIN_LEFT) {
-                 RESTORE();
-                 inflate_fast(strm, out);
-                 LOAD();
--- 
-2.14.1.581.gf28d330327-goog
-