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ASAN has not yet fully initialized by the time the CIG intercepts
execute. Most of the code works fine but the call to
std::unique_ptr ends up hitting an uninitialized instrumentation
and crashing.

Various options were considered including:

 * Add all of the std::unique_ptr calls used in the interception
   code to the exclusion list.
 * Implement our own smart pointers in the interception.
 * Just use stack allocations and/or dumb pointers in interception.

It seemed, upon reflection, the best use of engineering resources
to just disable CIG on ASAN builds.

BUG=995986

Change-Id: I5078a21c70864d7e14a8196ec05bb217b3251f41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763095Reviewed-by: James Forshaw <forshaw@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689208}