use os_bsd and OS_BSD and add some OS_FREEBSD conditions

this change is the first part of the FreeBSD support

BUG=
TEST=


Review URL: http://codereview.chromium.org/8773051

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112936 0039d316-1c4b-4281-b951-d872f2087c98

diff --git a/base/process_util.h b/base/process_util.h
index 3c9dfbe..9bcd6d4 100644
--- a/base/process_util.h
+++ b/base/process_util.h

@@ -14,14 +14,14 @@
 #if defined(OS_WIN)
 #include <windows.h>
 #include <tlhelp32.h>
-#elif defined(OS_MACOSX) || defined(OS_OPENBSD)
+#elif defined(OS_MACOSX) || defined(OS_BSD)
 // kinfo_proc is defined in <sys/sysctl.h>, but this forward declaration
 // is sufficient for the vector<kinfo_proc> below.
 struct kinfo_proc;
 // malloc_zone_t is defined in <malloc/malloc.h>, but this forward declaration
 // is sufficient for GetPurgeableZone() below.
 typedef struct _malloc_zone_t malloc_zone_t;
-#if !defined(OS_OPENBSD)
+#if !defined(OS_BSD)
 #include <mach/mach.h>
 #endif
 #elif defined(OS_POSIX)
@@ -167,7 +167,7 @@
 // Win XP SP1 as well.
 BASE_EXPORT ProcessId GetProcId(ProcessHandle process);
 
-#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_OPENBSD)
+#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_BSD)
 // Returns the path to the executable of the given process.
 BASE_EXPORT FilePath GetProcessExecutablePath(ProcessHandle process);
 #endif
@@ -568,7 +568,7 @@
 #if defined(OS_WIN)
   HANDLE snapshot_;
   bool started_iteration_;
-#elif defined(OS_MACOSX) || defined(OS_OPENBSD)
+#elif defined(OS_MACOSX) || defined(OS_BSD)
   std::vector<kinfo_proc> kinfo_procs_;
   size_t index_of_kinfo_proc_;
 #elif defined(OS_POSIX)