Move hashmap into base/.

src/wasm/wasm-js.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_JS_H_
 #define V8_WASM_JS_H_
 
 #ifndef V8_SHARED
 #include "src/allocation.h"
-#include "src/hashmap.h"
+#include "src/base/hashmap.h"
 #else
 #include "include/v8.h"
 #include "src/base/compiler-specific.h"
 #endif  // !V8_SHARED
 
 namespace v8 {
 namespace internal {
 // Exposes a WASM API to JavaScript through the V8 API.
 class WasmJs {
  public:
   static void Install(Isolate* isolate, Handle<JSGlobalObject> global_object);
   static void InstallWasmFunctionMap(Isolate* isolate, Handle<Context> context);
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif