Breakpad: Avoid using the C++ <cfoo> headers.

This patch avoids unnecessary use of the <cfoo> headers in files that don't
actually use the identifiers they declare in the std:: namespace.

It also changes some files to better conform with the "Names and Order of
Includes" rules in the Google C++ Style Guide.

A=jimb R=mark

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@619 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/common/module_unittest.cc

@@ -31,10 +31,10 @@
 
 // module_unittest.cc: Unit tests for google_breakpad::Module.
 
-#include <cerrno>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include <algorithm>
 #include <string>