Fixes some memory leaks in //runtime/bin

runtime/bin/process_android.cc

Index: runtime/bin/process_android.cc
diff --git a/runtime/bin/process_android.cc b/runtime/bin/process_android.cc
index b9d245bbb888e8e0051c7f1c6da252de79d1791c..6f2394dd14ffecc7df57bb607c2c80d3aaa5ffc6 100644
--- a/runtime/bin/process_android.cc
+++ b/runtime/bin/process_android.cc
@@ -16,6 +16,7 @@
 #include <sys/wait.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 
+#include "bin/dartutils.h"
 #include "bin/fdutils.h"
 #include "bin/lockers.h"
 #include "bin/log.h"
@@ -635,7 +636,9 @@ class ProcessStarter {
     int actual_errno = errno;
     // If CleanupAndReturnError is called without an actual errno make
     // sure to return an error anyway.
-    if (actual_errno == 0) actual_errno = EPERM;
+    if (actual_errno == 0) {
+      actual_errno = EPERM;
+    }
     SetChildOsErrorMessage();
     CloseAllPipes();
     return actual_errno;
@@ -644,9 +647,9 @@ class ProcessStarter {
 
   void SetChildOsErrorMessage() {
     const int kBufferSize = 1024;
-    char error_message[kBufferSize];
+    char* error_message = DartUtils::ScopedCString(kBufferSize);
     Utils::StrError(errno, error_message, kBufferSize);
-    *os_error_message_ = strdup(error_message);
+    *os_error_message_ = error_message;
   }
 
 
@@ -681,7 +684,7 @@ class ProcessStarter {
 
   void ReadChildError() {
     const int kMaxMessageSize = 256;
-    char* message = static_cast<char*>(malloc(kMaxMessageSize));
+    char* message = DartUtils::ScopedCString(kMaxMessageSize);
     if (message != NULL) {
       FDUtils::ReadFromBlocking(exec_control_[0], message, kMaxMessageSize);
       message[kMaxMessageSize - 1] = '\0';