Add a leak suppression for crash keys.

According to crbug.com/961017#c11, we always intentionally
leak crash keys.

Bug:961017

Change-Id: Ic515375a93180998e4adab03daf739d1cd56d494
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614101
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662230}

build/sanitizers/lsan_suppressions.cc

@@ -63,6 +63,10 @@ char kLSanDefaultSuppressions[] =
     "leak:blink::DOMWrapperWorld::Create\n"
     "leak:blink::ScriptState::Create\n"
 
+    // Crash keys are intentionally leaked.
+    "leak:crash_reporter::(anonymous "
+    "namespace)::CrashKeyBaseSupport::Allocate\n"
+
     // PLEASE READ ABOVE BEFORE ADDING NEW SUPPRESSIONS.
 
     // End of suppressions.