Use stdint.h types throughout PDFium.

core/src/fpdfdoc/doc_link.cpp

Index: core/src/fpdfdoc/doc_link.cpp
diff --git a/core/src/fpdfdoc/doc_link.cpp b/core/src/fpdfdoc/doc_link.cpp
index 1957960d0fe082c997247a6c0003951e0c8c0682..0109e7c9b359e1844f0657121c7fe6c9bbb59249 100644
--- a/core/src/fpdfdoc/doc_link.cpp
+++ b/core/src/fpdfdoc/doc_link.cpp
@@ -23,9 +23,9 @@ CFX_PtrArray* CPDF_LinkList::GetPageLinks(CPDF_Page* pPage)
         return NULL;
     }
     CFX_PtrArray* pPageLinkList = NULL;
-    if (!m_PageMap.Lookup((FX_LPVOID)(FX_UINTPTR)objnum, (FX_LPVOID&)pPageLinkList)) {
+    if (!m_PageMap.Lookup((FX_LPVOID)(uintptr_t)objnum, (FX_LPVOID&)pPageLinkList)) {
         pPageLinkList = new CFX_PtrArray;
-        m_PageMap.SetAt((FX_LPVOID)(FX_UINTPTR)objnum, pPageLinkList);
+        m_PageMap.SetAt((FX_LPVOID)(uintptr_t)objnum, pPageLinkList);
         LoadPageLinks(pPage, pPageLinkList);
     }
     return pPageLinkList;