[Liftoff][cleanup] Remove unused include

R=vogelheim@chromium.org

Bug: v8:6600
Change-Id: I7e8abdbbde312a42898486b88791ba8f7558cfc4
Reviewed-on: https://chromium-review.googlesource.com/1065770Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53247}

src/wasm/baseline/liftoff-assembler.cc

@@ -7,7 +7,6 @@
 #include "src/assembler-inl.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/wasm-compiler.h"
-#include "src/counters.h"
 #include "src/macro-assembler-inl.h"
 #include "src/wasm/function-body-decoder-impl.h"
 #include "src/wasm/wasm-opcodes.h"