Fix ASAN canary crashes.

The ASAN startup code now uses an exported function GetUploadsEnabled from chrome_elf to determine
whether uploads are enabled. Additionally we don't link with crashpad/app in chrome.exe. chrome.exe
now links with the new library target crashpad/run_as_crashpad_handler. The ASAN kasko code today
gets exported crash functions from the exe, which won't work correctly due to crashpad having moved
to chrome_elf.dll. This needs to be fixed for ASAN crashes to be reported correctly.

BUG=638370, 604923

Review-Url: https://codereview.chromium.org/2250263002
Cr-Commit-Position: refs/heads/master@{#412405}
6 files changed