Remove the content dependency on allocator.gyp

Remove the content dependency on allocator.gyp

I think I added this because webkit_glue had the dependency but
wasn't declaring it, and this was before I fixed that (and
before glue was a separate component).

Having the dependency declared in both is not only wrong, but
is causing heapchecker to fail on linux.

R=jam@chromium.org
BUG=112389
TEST=compile linux w/ component=shared_library and linux_use_heapchecker=1
and try to run unit_tests; it should actually run.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=126212

[jam, 2012-03-09 23:29:26]

lgtm