Fixes some memory leaks in //runtime/bin

runtime/bin/platform_linux.cc

Index: runtime/bin/platform_linux.cc
diff --git a/runtime/bin/platform_linux.cc b/runtime/bin/platform_linux.cc
index 24cbfd3ebf58bd840cfffdfb17784544ffb332c7..c6dc3ccb15bcc74aa14208ac94ef7c111fa6d510 100644
--- a/runtime/bin/platform_linux.cc
+++ b/runtime/bin/platform_linux.cc
@@ -14,7 +14,6 @@
 
 #include "bin/fdutils.h"
 
-
 namespace dart {
 namespace bin {
 
@@ -58,9 +57,12 @@ char** Platform::Environment(intptr_t* count) {
   // provide access to modifying environment variables.
   intptr_t i = 0;
   char** tmp = environ;
-  while (*(tmp++) != NULL) i++;
+  while (*(tmp++) != NULL) {
+    i++;
+  }
   *count = i;
-  char** result = new char*[i];
+  char** result;
+  result = reinterpret_cast<char**>(Dart_ScopeAllocate(i * sizeof(*result)));
   for (intptr_t current = 0; current < i; current++) {
     result[current] = environ[current];
   }
@@ -68,15 +70,11 @@ char** Platform::Environment(intptr_t* count) {
 }
 
 
-void Platform::FreeEnvironment(char** env, intptr_t count) {
-  delete[] env;
-}
-
-
-char* Platform::ResolveExecutablePath() {
+const char* Platform::ResolveExecutablePath() {
   return File::LinkTarget("/proc/self/exe");
 }
 
+
 void Platform::Exit(int exit_code) {
   exit(exit_code);
 }