[vm] Remove unused endian-conversion code

These seem to have accidentally snuck in as part of
https://codereview.chromium.org/14299008

Change-Id: I861eba1655d6f175ddfabf2a39908168b890d911
Reviewed-on: https://dart-review.googlesource.com/c/91104
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Siva Annamalai <asiva@google.com>
diff --git a/runtime/vm/os_android.cc b/runtime/vm/os_android.cc
index 54bda8a..3feeea1 100644
--- a/runtime/vm/os_android.cc
+++ b/runtime/vm/os_android.cc
@@ -9,7 +9,6 @@
 
 #include <android/log.h>   // NOLINT
 #include <endian.h>        // NOLINT
-#include <errno.h>         // NOLINT
 #include <limits.h>        // NOLINT
 #include <malloc.h>        // NOLINT
 #include <sys/resource.h>  // NOLINT
@@ -249,30 +248,6 @@
       __builtin_extract_return_addr(__builtin_return_address(0)));
 }
 
-uint16_t HostToBigEndian16(uint16_t value) {
-  return htobe16(value);
-}
-
-uint32_t HostToBigEndian32(uint32_t value) {
-  return htobe32(value);
-}
-
-uint64_t HostToBigEndian64(uint64_t value) {
-  return htobe64(value);
-}
-
-uint16_t HostToLittleEndian16(uint16_t value) {
-  return htole16(value);
-}
-
-uint32_t HostToLittleEndian32(uint32_t value) {
-  return htole32(value);
-}
-
-uint64_t HostToLittleEndian64(uint64_t value) {
-  return htole64(value);
-}
-
 void OS::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);