Revert 20313 - "Ship promises and weak collections"

test/mjsunit/harmony/regress/regress-observe-empty-double-array.js

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-// Flags: --allow-natives-syntax
+// Flags: --harmony-observation --allow-natives-syntax
 //
 // Test passes if it does not crash.
 
 arr = [1.1];
 Object.observe(arr, function(){});
 arr.length = 0;
 // TODO(observe): we currently disallow fast elements for observed object.
 // assertTrue(%HasFastDoubleElements(arr));
 // Should not crash
 arr.push(1.1);