Get rid of <iostream> include in stack_trace_posix (forces a static initializer)

base/debug/stack_trace_posix.cc

Index: base/debug/stack_trace_posix.cc
diff --git a/base/debug/stack_trace_posix.cc b/base/debug/stack_trace_posix.cc
index 75dd10d3d75ce8cfaa9c0ef7c24d347067b9de64..2097853a0ae4e2e7f9ae8ca54d5ba90784cd2323 100644
--- a/base/debug/stack_trace_posix.cc
+++ b/base/debug/stack_trace_posix.cc
@@ -25,8 +25,6 @@
 #include <AvailabilityMacros.h>
 #endif
 
-#include <iostream>
-
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
@@ -170,7 +168,7 @@ void StackTrace::PrintBacktrace() const {
   std::vector<std::string> trace_strings;
   GetBacktraceStrings(trace_, count_, &trace_strings, NULL);
   for (size_t i = 0; i < trace_strings.size(); ++i) {
-    std::cerr << "\t" << trace_strings[i] << "\n";
+    fprintf(stderr, "\t%s\n", trace_strings[i].c_str());
   }
 }