Fixes some memory leaks in //runtime/bin

runtime/bin/process_win.cc

Index: runtime/bin/process_win.cc
diff --git a/runtime/bin/process_win.cc b/runtime/bin/process_win.cc
index ebf4ce3982c118d5403ffa8598c7fe2a4afcd7c8..0496065ea5271f3f85fbc39ecad765bfd07302cb 100644
--- a/runtime/bin/process_win.cc
+++ b/runtime/bin/process_win.cc
@@ -8,6 +8,7 @@
 #include <process.h>  // NOLINT
 
 #include "bin/builtin.h"
+#include "bin/dartutils.h"
 #include "bin/process.h"
 #include "bin/eventhandler.h"
 #include "bin/lockers.h"
@@ -464,8 +465,6 @@ class ProcessStarter {
       remaining -= written;
       ASSERT(remaining >= 0);
     }
-    free(const_cast<wchar_t*>(system_path));
-    for (int i = 0; i < arguments_length; i++) free(system_arguments[i]);
     delete[] system_arguments;
 
     // Create environment block if an environment is supplied.
@@ -498,9 +497,6 @@ class ProcessStarter {
       // Block-terminating zero char.
       environment_block_[block_index++] = '\0';
       ASSERT(block_index == block_size);
-      for (intptr_t i = 0; i < environment_length; i++) {
-        free(system_environment[i]);
-      }
       delete[] system_environment;
     }
 
@@ -518,9 +514,6 @@ class ProcessStarter {
     // Deallocate command-line and environment block strings.
     delete[] command_line_;
     delete[] environment_block_;
-    if (system_working_directory_ != NULL) {
-      free(const_cast<wchar_t*>(system_working_directory_));
-    }
     if (attribute_list_ != NULL) {
       delete_proc_thread_attr_list(attribute_list_);
       free(attribute_list_);