Ensure the OSX crash catcher does not trigger on SIGABRT when disabled.

This CL also re-enables NaClBrowserTestNewlib.Bad. This test was
disabled because there were unautomated "visual tests" embeded in the
test's html. These embeds declared a pdf content type.  When the PDF
plugin was open sourced, this content type started being recognized
and the test broke.

This test was historically flaky, however. One reason  was that pauses
caused by the OS crash catcher could cause the test to time out. The
OS crash catcher was triggering because NaCl calls abort() in response
to many fatal errors. This test is being re-enabled to show abort is
no longer triggering the crash catcher.

BUG=375103

Review URL: https://codereview.chromium.org/347803004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278617 0039d316-1c4b-4281-b951-d872f2087c98

base/mac/os_crash_dumps.cc

@@ -30,11 +30,14 @@ void DisableOSCrashDumps() {
   // bsd/uxkern/ux_exception.c and machine_exception() in xnu's
   // bsd/dev/*/unix_signal.c.
   const int signals_to_intercept[] = {
+    // Hardware faults
     SIGILL,   // EXC_BAD_INSTRUCTION
     SIGTRAP,  // EXC_BREAKPOINT
     SIGFPE,   // EXC_ARITHMETIC
     SIGBUS,   // EXC_BAD_ACCESS
-    SIGSEGV   // EXC_BAD_ACCESS
+    SIGSEGV,  // EXC_BAD_ACCESS
+    // Not a hardware fault
+    SIGABRT
   };
 
   // For all these signals, just wire things up so we exit immediately.

chrome/test/data/nacl/bad/ppapi_bad.html

@@ -197,24 +197,6 @@ function runTests() {
 <!-- The tests will create and remove embeds from this div. -->
 <div id="embeds"></div>
 
-<!-- These two embeds are not automatically tested - visual inspection only. -->
-
-<embed id="cross_manifest_pdf"
-  width=100 height=20
-  src="http://www.google.com/crossorigin.manifest"
-  style="background-color:gray"
-  type="application/pdf" />
-
-<!-- This load would have succeeded if the NEXE was from a chrome-extension
-     URL and NaCl had been registered as handling the PDF MIME type using
-     the nacl_modules attribute in a Chrome extension manifest. -->
-
-<embed id="cross_origin_pdf"
-  width=100 height=20
-  src="ppapi_bad_crossorigin.nmf"
-  style="background-color:gray"
-  type="application/pdf" />
-
 <script type="text/javascript">
 //<![CDATA[
 runTests();

chrome/test/nacl/nacl_browsertest.cc

@@ -87,9 +87,7 @@ NACL_BROWSER_TEST_F(NaClBrowserTest, ProgressEvents, {
 // allowed.  Also not run on GLibc because it's a large test that is at risk of
 // causing timeouts.
 // crbug/338444
-// crbug.com/375103: fails on Mac after open sourcing PDF plugin.
-// crbug.com/375103: fails on Linux too after open sourcing PDF plugin.
-#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+#if defined(OS_WIN)
 #define MAYBE_Bad DISABLED_Bad
 #else
 #define MAYBE_Bad Bad