Small cleanup on CPVT_Wordplace

-- Move initialization to member decls
-- Use default ctor in one caller
-- assert const member at construction time.

Change-Id: I9d3c96dca607c82d9fcad170bac6e5c5869a55d0
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/79310
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

core/fpdfdoc/cpdf_variabletext.cpp

diff --git a/core/fpdfdoc/cpdf_variabletext.cpp b/core/fpdfdoc/cpdf_variabletext.cpp
index 57df06f..ce48851 100644
--- a/core/fpdfdoc/cpdf_variabletext.cpp
+++ b/core/fpdfdoc/cpdf_variabletext.cpp
@@ -78,8 +78,9 @@
   return 0;
 }
 
-CPDF_VariableText::Iterator::Iterator(CPDF_VariableText* pVT)
-    : m_CurPos(-1, -1, -1), m_pVT(pVT) {}
+CPDF_VariableText::Iterator::Iterator(CPDF_VariableText* pVT) : m_pVT(pVT) {
+  DCHECK(m_pVT);
+}
 
 CPDF_VariableText::Iterator::~Iterator() = default;
 
@@ -88,7 +89,6 @@
 }
 
 void CPDF_VariableText::Iterator::SetAt(const CPVT_WordPlace& place) {
-  DCHECK(m_pVT);
   m_CurPos = place;
 }
 

core/fpdfdoc/cpvt_wordplace.h

diff --git a/core/fpdfdoc/cpvt_wordplace.h b/core/fpdfdoc/cpvt_wordplace.h
index c0a1a9c..8843757 100644
--- a/core/fpdfdoc/cpvt_wordplace.h
+++ b/core/fpdfdoc/cpvt_wordplace.h
@@ -10,7 +10,7 @@
 #include "core/fxcrt/fx_system.h"
 
 struct CPVT_WordPlace {
-  CPVT_WordPlace() : nSecIndex(-1), nLineIndex(-1), nWordIndex(-1) {}
+  CPVT_WordPlace() = default;
 
   CPVT_WordPlace(int32_t other_nSecIndex,
                  int32_t other_nLineIndex,
@@ -65,9 +65,9 @@
     return nLineIndex - wp.nLineIndex;
   }
 
-  int32_t nSecIndex;
-  int32_t nLineIndex;
-  int32_t nWordIndex;
+  int32_t nSecIndex = -1;
+  int32_t nLineIndex = -1;
+  int32_t nWordIndex = -1;
 };
 
 #endif  // CORE_FPDFDOC_CPVT_WORDPLACE_H_