Make most PDFium code pass Clang plugin's auto raw check.

Change-Id: I9dc32342e24361389841ecba83081a97fc043377
Reviewed-on: https://pdfium-review.googlesource.com/2959
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_annotiteration.cpp b/fpdfsdk/cpdfsdk_annotiteration.cpp
index dd99ade..d256950 100644
--- a/fpdfsdk/cpdfsdk_annotiteration.cpp
+++ b/fpdfsdk/cpdfsdk_annotiteration.cpp
@@ -33,7 +33,7 @@
     std::reverse(copiedList.begin(), copiedList.end());
 
   m_List.reserve(copiedList.size());
-  for (const auto& pAnnot : copiedList)
+  for (auto* pAnnot : copiedList)
     m_List.emplace_back(pAnnot);
 }