chromium: Fix build error.

testing/chromium/checksums

@@ -69,3 +69,4 @@ b07a4903f150da643320012880622b6d52c0ccf1e85d3425240188277ee546ef  perfetto.patch
 3f55f3ed81f4d967b8eb45655ddbdd3a59da3d69dbf1999a9335b199c84d1c9d  unrar.patch
 815a2a41003747bb6b44df192af4650e9ea0fe2dc87bb689a9bbb6e7a2c3eddd  welcome-page.patch
 9058162657672162964d2f35431c208d1cfae12325858ff636044d667e9dcaf5  disable_swiftshader.patch
+fbc5e4e2c3b4bca3b5c0e30c050c72429cb734b86dc665b3e74cfe832426c2cb  chromium-75.0.3770.80-no-zlib-mangle.patch

testing/chromium/patches/chromium-75.0.3770.80-no-zlib-mangle.patch

@@ -0,0 +1,14 @@
+diff -up chromium-75.0.3770.80/third_party/zlib/zconf.h.nozmangle chromium-75.0.3770.80/third_party/zlib/zconf.h
+--- chromium-75.0.3770.80/third_party/zlib/zconf.h.nozmangle	2019-06-05 11:12:30.420412467 -0400
++++ chromium-75.0.3770.80/third_party/zlib/zconf.h	2019-06-05 11:17:43.512683058 -0400
+@@ -8,10 +8,6 @@
+ #ifndef ZCONF_H
+ #define ZCONF_H
+ 
+-/* This include does prefixing as below, but with an updated set of names.  Also
+- * sets up export macros in component builds. */
+-#include "chromeconf.h"
+-
+ /*
+  * If you *really* need a unique prefix for all types and library functions,
+  * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.

testing/chromium/sources

@@ -69,3 +69,4 @@ patches/safe_browsing-disable-reporting-of-safebrowsing-over.patch
 patches/unrar.patch
 patches/welcome-page.patch
 patches/disable_swiftshader.patch
+patches/chromium-75.0.3770.80-no-zlib-mangle.patch