Merge trunk r97497 and its many dependents to the 14.0.835 branch.

third_party/mach_override/README.chromium

Index: third_party/mach_override/README.chromium
===================================================================
--- third_party/mach_override/README.chromium	(revision 98423)
+++ third_party/mach_override/README.chromium	(working copy)
@@ -2,8 +2,8 @@
 Short Name: Part of the mach_star project
 Version: Unknown
 URL: https://github.com/rentzsch/mach_star
-Date: 04/18/2011
-Revision: 32c4560eb09848073f69
+Date: 08/19/2011
+Revision: 87f491f8acef924d2ba90dd55fc23ad64f9d5bbd
 License: MIT
 Security Critical: Yes
 
@@ -11,7 +11,7 @@
 Description:
 This is the mach_override part of mach_star, namely:
 
-  https://github.com/rentzsch/mach_star/tree/aeb1720815c7255070da0f548267ccfdf7bd50b7
+  https://github.com/rentzsch/mach_star/tree/87f491f8acef924d2ba90dd55fc23ad64f9d5bbd
 
 This package is used to replace framework functions with different
 implementations at run time.
@@ -19,21 +19,10 @@
 
 Local Modifications:
 
-Enabled makeIslandExecutable for 32-bit i386. Main executables linked and run
-on Mac OS X 10.7 ("Lion") have non-executable heap pages by default. See
-http://crbug.com/79642.
-
-Changed the logic surrounding calls to makeIslandExecutable so that
-mach_override_ptr can return successfully when originalFunctionReentryIsland,
-an optional argument, is NULL. Failure in makeIslandExecutable will now
-trigger cleanup of allocated memory.
-
-Changed allocateBranchIsland to use a more appropriate address range per
-http://developer.apple.com/library/mac/#documentation/Performance/Conceptual/LaunchTime/Articles/Prebinding.html.
-The range for x86 (32-bit) with kAllocateHigh set is now [0xffc00000,
-0xffe00000). In this configuration, the loop is now guaranteed to terminate
-instead of exceeding its permitted range. Previously, this function would
-begin looking for a page at 0xfefff000 and would not stop, even after wrapping
-around to low memory. The URL above states 0xfefff000 is within a range marked
-"Reserved for use by the pasteboard and other system services. Do not use this
-address range."
+reentryIsland is allocated in high memory with vm_allocate rather than the
+heap with malloc by changing the allocation policy to kAllocateHigh. It
+appears probable that putting the reentry island in the heap causes its page
+to lose execute permission at some point under some circumstances, which
+results in a crash on Lion. This modification is temoprary to simply test
+out the theory. If proven, the code will be improved somewhat.
+http://crbug.com/93736.