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If shared memory returns bad data, then UserScriptSet might end up
allocating too much data.  This might distract crash reports to think
there was an OOM error. Set an arbitrary limit to number of scripts:
roughly 1000 extensions * 100 scripts = 100000u.

Also put |pickle_size| in crash stack to aid debugging crash reports.

Bug: 723381
Change-Id: Idf96137f5f7adec87adbacd5a276253dc5f24842
Reviewed-on: https://chromium-review.googlesource.com/570987
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486879}