base: Fix export for LsanPageAllocator

Bug: chromium:1056170
Change-Id: I0206078a672cb66edf6590430b35b7c3bc9ce1eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2852238
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74194}

src/base/sanitizer/lsan-page-allocator.h

@@ -6,6 +6,7 @@
 #define V8_BASE_SANITIZER_LSAN_PAGE_ALLOCATOR_H_
 
 #include "include/v8-platform.h"
+#include "src/base/base-export.h"
 #include "src/base/compiler-specific.h"
 
 namespace v8 {
@@ -14,7 +15,7 @@ namespace base {
 // This is a v8::PageAllocator implementation that decorates provided page
 // allocator object with leak sanitizer notifications when LEAK_SANITIZER
 // is defined.
-class LsanPageAllocator : public v8::PageAllocator {
+class V8_BASE_EXPORT LsanPageAllocator : public v8::PageAllocator {
  public:
   explicit LsanPageAllocator(v8::PageAllocator* page_allocator);
   ~LsanPageAllocator() override = default;