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Reading from procfs returns at most a page-sized amount of data. If the process has a larger-than-page-sized /proc/self/maps, we cannot guarantee that the virtual memory table hasn't changed while reading the entire contents from procfs.

In addition, ReadProcMaps() now stops reading as soon as it finds a gate VMA entry to workaround a scenario where the kernel would return duplicate entries (it turns out ThreadSanitizer v2 was very good at triggering said scenario).

BUG=258451

Review URL: https://chromiumcodereview.appspot.com/18661009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221570 0039d316-1c4b-4281-b951-d872f2087c98