[wasm] Remove unused include.

BUG=v8:4914
R=gdeepti@chromium.org

Review-Url: https://codereview.chromium.org/2226613002
Cr-Commit-Position: refs/heads/master@{#38447}

src/compiler/wasm-compiler.cc

@@ -18,7 +18,6 @@
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/int64-lowering.h"
-#include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/linkage.h"