[debug][wasm] Move DebugEvaluate implementation to wasm-debug.cc.

Previously the proxies that make up the DebugEvaluate implementation for
Wasm frames lived in wasm-js.cc, but that was quite confusing since

(a) the rest of the debug support for Wasm lives in wasm-debug.cc (and
    we intend to eventually unify the DebugEvaluate and Scope objects),
    and
(b) the wasm-js.cc file is explicitly about the WebAssembly JS API
    that's part of the WebAssembly specification, and the DebugEvaluate
    proxies aren't part of that.

Bug: chromium:1162229, chromium:1071432, chromium:1127914
Change-Id: I63016dcace6d8e2af4a03c8eed4f02d464c1dee1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2609418
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71911}

src/debug/debug-evaluate.cc

@@ -18,7 +18,6 @@
 #include "src/objects/contexts.h"
 #include "src/snapshot/snapshot.h"
 #include "src/wasm/wasm-debug.h"
-#include "src/wasm/wasm-js.h"
 
 namespace v8 {
 namespace internal {
@@ -101,7 +100,7 @@ MaybeHandle<Object> DebugEvaluate::Local(Isolate* isolate,
     WasmFrame* frame = WasmFrame::cast(it.frame());
     Handle<SharedFunctionInfo> outer_info(
         isolate->native_context()->empty_function().shared(), isolate);
-    Handle<JSProxy> context_extension = WasmJs::GetJSDebugProxy(frame);
+    Handle<JSProxy> context_extension = wasm::GetJSDebugProxy(frame);
     Handle<ScopeInfo> scope_info =
         ScopeInfo::CreateForWithScope(isolate, Handle<ScopeInfo>::null());
     Handle<Context> context = isolate->factory()->NewWithContext(

src/wasm/wasm-debug.h

@@ -21,6 +21,7 @@ namespace internal {
 template <typename T>
 class Handle;
 class JSObject;
+class JSProxy;
 template <typename T>
 class Vector;
 class WasmFrame;
@@ -194,6 +195,8 @@ class V8_EXPORT_PRIVATE DebugInfo {
   std::unique_ptr<DebugInfoImpl> impl_;
 };
 
+Handle<JSProxy> GetJSDebugProxy(WasmFrame* frame);
+
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8

src/wasm/wasm-js.h

@@ -9,7 +9,6 @@
 
 namespace v8 {
 namespace internal {
-class JSProxy;
 class WasmFrame;
 
 namespace wasm {
@@ -21,8 +20,6 @@ class WasmJs {
  public:
   V8_EXPORT_PRIVATE static void Install(Isolate* isolate,
                                         bool exposed_on_global_object);
-
-  V8_EXPORT_PRIVATE static Handle<JSProxy> GetJSDebugProxy(WasmFrame* frame);
 };
 
 }  // namespace internal