This improves performance on heavy pages by increasing
max_executable_size_ and max_old_generation_size_.

There is now no need for an Android specific LUMP_OF_MEMORY.

Review URL: https://chromiumcodereview.appspot.com/10541053
Patch from Ben Murdoch <benm@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11740 ce2b1a6d-e550-0410-aec6-3dcde31c8c00