Fix the gdb path for NDK-r8b.

content/shell/content_shell_ant_helper.sh

Index: content/shell/content_shell_ant_helper.sh
diff --git a/content/shell/content_shell_ant_helper.sh b/content/shell/content_shell_ant_helper.sh
index 9a013c71d3a6639d19aa44952a654fba91cd29ac..0008a65b7c5f6fd7e576d1386abaeefba34518ed 100755
--- a/content/shell/content_shell_ant_helper.sh
+++ b/content/shell/content_shell_ant_helper.sh
@@ -6,13 +6,13 @@
 
 set -eu
 
-# A helper script to help convert the values of the fifth parameter for
+# A helper script to help convert the values of the last parameter for
 # ant building: 'Debug' -> 'debug'; 'Release' -> 'release'.
 # It's used by content/content_shell.gypi
 
-buildtype="$(echo "${11}" | tr '[A-Z]' '[a-z]')"
+buildtype="$(echo "${@: -1}" | tr '[A-Z]' '[a-z]')"
 
 # TODO(yongsheng): enable build type by adding "${buildtype}" into the
 # end of parameter list once the workflow is ready to support release
 # mode.
-exec "${1}" "${2}" "${3}" "${4}" "${5}" "${6}" "${7}" "${8}" "${9}" "${10}"
+exec "${@:1:$((${#@} - 1))}"