Remove 32-bit Mac implementation of EnableTerminationOnHeapCorruption().

This removes CrMallocErrorBreak, since in 64-bit mode, Libc's malloc already
makes this case fatal.

BUG=453141
R=mark@chromium.org

Review URL: https://codereview.chromium.org/889583003

Cr-Commit-Position: refs/heads/master@{#313728}

base/BUILD.gn

@@ -903,7 +903,6 @@ component("base") {
       "native_library_posix.cc",
       "strings/sys_string_conversions_posix.cc",
     ]
-    deps += [ "//third_party/mach_override" ]
   } else {
     # Non-Mac.
     sources -= [

base/base.gyp

@@ -201,9 +201,6 @@
               '$(SDKROOT)/System/Library/Frameworks/Security.framework',
             ],
           },
-          'dependencies': [
-            '../third_party/mach_override/mach_override.gyp:mach_override',
-          ],
         }],
         ['OS == "ios" and _toolset != "host"', {
           'link_settings': {

base/process/memory_unittest.cc

@@ -150,10 +150,8 @@ TEST(ProcessMemoryTest, MacTerminateOnHeapCorruption) {
   ASSERT_DEATH(free(buf), "attempting free on address which "
       "was not malloc\\(\\)-ed");
 #else
-  ASSERT_DEATH(free(buf), "being freed.*\\n?\\.*"
-      "\\*\\*\\* set a breakpoint in malloc_error_break to debug.*\\n?.*"
-      "Terminating process due to a potential for future heap corruption");
-#endif  // ARCH_CPU_64_BITS || defined(ADDRESS_SANITIZER)
+  ADD_FAILURE() << "This test is not supported in this build configuration.";
+#endif
 }
 
 #endif  // defined(OS_MACOSX)