Update mach_override to upstream 1a1bb352

CFLog, which is overridden by content/renderer/renderer_main_platform_delegate_mac.mm, contains the following instruction in 64-bit form on 10.6.8 and 10.7.5:

4881ECD0000000                  sub        rsp, 0xd0

mach_override’s puny simplistic fake disassembler didn’t understand this instruction. This resulted in mach_override failing, which triggered a CHECK failure during renderer startup, with the result that everything would be a sad tab on 10.6 and 10.7 64-bit.

The latest version of mach_override replaces its weak old non-disassembler with libudis86, which should be much more capable in the area of understanding instructions, and which should improve mach_override’s ability to patch code without always having to retrain it.

In the mean time, the upstream change that was probably causing us to be unable to update to the current HEAD (rentzsch/mach_star@498e0ba3)
has been backed out since then (rentzsch/mach_override@1b3aa46f), so it should now be safe to update to HEAD.

Local patches https://codereview.chromium.org/21208002/ and https://codereview.chromium.org/22798004/ have been reapplied with minor fixes to work with the current version.

BUG=315218
R=avi@chromium.org

Review URL: https://codereview.chromium.org/61273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233175 0039d316-1c4b-4281-b951-d872f2087c98

third_party/mach_override/LICENSE

@@ -1,2 +1,27 @@
-Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
-Some rights reserved: <http://opensource.org/licenses/mit-license.php>
+Copyright (c) 2003-2012 Jonathan 'Wolf' Rentzsch: http://rentzsch.com
+Some rights reserved: http://opensource.org/licenses/mit
+
+mach_override includes a copy of libudis86, licensed as follows:
+
+Copyright (c) 2002-2009 Vivek Thampi
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice, 
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice, 
+      this list of conditions and the following disclaimer in the documentation 
+      and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

third_party/mach_override/README.chromium

@@ -1,20 +1,20 @@
 Name: mach_override
-Short Name: Part of the mach_star project
-Version: Unknown
-URL: https://github.com/rentzsch/mach_star
-Date: 11/14/2012
-Revision: 10860416803280f05cbe20f97a3ec02a7c697bf4
-License: MIT
+Short Name: mach_override
+Version: Newer than 1.2. HEAD from branch semver-1.x.
+URL: https://github.com/rentzsch/mach_override
+Date: 2013-08-21
+Revision: 1a1bb35291a915c545842cd64b5e12e1e76883fc
+License: MIT and 2-clause BSD
 Security Critical: Yes
 
 
 Description:
-This is the mach_override part of mach_star, namely:
-https://github.com/rentzsch/mach_star/tree/10860416803280f05cbe20f97a3ec02a7c697bf4
-
 This package is used to replace framework functions with different
 implementations at run time.
 
+mach_override includes a copy of libudis86 1.7.1, available separately from
+http://udis86.sourceforge.net/ and https://github.com/vmt/udis86 .
+
 
 Local Modifications:
 Ensure no rwx pages remain after mach_override_ptr: