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/dwarf/dwarf2diehandler.cc

@@ -31,10 +31,10 @@
 // dwarf2diehandler.cc: Implement the dwarf2reader::DieDispatcher class.
 // See dwarf2diehandler.h for details.
 
-#include <cassert>
-
 #include "common/dwarf/dwarf2diehandler.h"
 
+#include <assert.h>
+
 namespace dwarf2reader {
 
 DIEDispatcher::~DIEDispatcher() {