Get rid of NULLs in core/

core/fpdfapi/fpdf_cmaps/GB1/cmaps_gb1.cpp

Index: core/fpdfapi/fpdf_cmaps/GB1/cmaps_gb1.cpp
diff --git a/core/fpdfapi/fpdf_cmaps/GB1/cmaps_gb1.cpp b/core/fpdfapi/fpdf_cmaps/GB1/cmaps_gb1.cpp
index 34a43858b4f301d1ecea2b968162e069d9d2b775..35e4894382cf1d2f7d79deed6bf7f428c33ebebe 100644
--- a/core/fpdfapi/fpdf_cmaps/GB1/cmaps_gb1.cpp
+++ b/core/fpdfapi/fpdf_cmaps/GB1/cmaps_gb1.cpp
@@ -14,33 +14,33 @@
 
 static const FXCMAP_CMap g_FXCMAP_GB1_cmaps[] = {
     {"GB-EUC-H", FXCMAP_CMap::Range, g_FXCMAP_GB_EUC_H_0, 90, FXCMAP_CMap::None,
-     NULL, 0, 0},
+     nullptr, 0, 0},
     {"GB-EUC-V", FXCMAP_CMap::Range, g_FXCMAP_GB_EUC_V_0, 20, FXCMAP_CMap::None,
-     NULL, 0, -1},
+     nullptr, 0, -1},
     {"GBpc-EUC-H", FXCMAP_CMap::Range, g_FXCMAP_GBpc_EUC_H_0, 91,
-     FXCMAP_CMap::None, NULL, 0, 0},
+     FXCMAP_CMap::None, nullptr, 0, 0},
     {"GBpc-EUC-V", FXCMAP_CMap::Range, g_FXCMAP_GBpc_EUC_V_0, 20,
-     FXCMAP_CMap::None, NULL, 0, -1},
+     FXCMAP_CMap::None, nullptr, 0, -1},
     {"GBK-EUC-H", FXCMAP_CMap::Range, g_FXCMAP_GBK_EUC_H_2, 4071,
-     FXCMAP_CMap::None, NULL, 0, 0},
+     FXCMAP_CMap::None, nullptr, 0, 0},
     {"GBK-EUC-V", FXCMAP_CMap::Range, g_FXCMAP_GBK_EUC_V_2, 20,
-     FXCMAP_CMap::None, NULL, 0, -1},
+     FXCMAP_CMap::None, nullptr, 0, -1},
     {"GBKp-EUC-H", FXCMAP_CMap::Range, g_FXCMAP_GBKp_EUC_H_2, 4070,
-     FXCMAP_CMap::None, NULL, 0, -2},
+     FXCMAP_CMap::None, nullptr, 0, -2},
     {"GBKp-EUC-V", FXCMAP_CMap::Range, g_FXCMAP_GBKp_EUC_V_2, 20,
-     FXCMAP_CMap::None, NULL, 0, -1},
+     FXCMAP_CMap::None, nullptr, 0, -1},
     {"GBK2K-H", FXCMAP_CMap::Range, g_FXCMAP_GBK2K_H_5, 4071,
      FXCMAP_CMap::Single, g_FXCMAP_GBK2K_H_5_DWord, 1017, -4},
     {"GBK2K-V", FXCMAP_CMap::Range, g_FXCMAP_GBK2K_V_5, 41, FXCMAP_CMap::None,
-     NULL, 0, -1},
+     nullptr, 0, -1},
     {"UniGB-UCS2-H", FXCMAP_CMap::Range, g_FXCMAP_UniGB_UCS2_H_4, 13825,
-     FXCMAP_CMap::None, NULL, 0, 0},
+     FXCMAP_CMap::None, nullptr, 0, 0},
     {"UniGB-UCS2-V", FXCMAP_CMap::Range, g_FXCMAP_UniGB_UCS2_V_4, 24,
-     FXCMAP_CMap::None, NULL, 0, -1},
+     FXCMAP_CMap::None, nullptr, 0, -1},
     {"UniGB-UTF16-H", FXCMAP_CMap::Range, g_FXCMAP_UniGB_UCS2_H_4, 13825,
-     FXCMAP_CMap::None, NULL, 0, 0},
+     FXCMAP_CMap::None, nullptr, 0, 0},
     {"UniGB-UTF16-V", FXCMAP_CMap::Range, g_FXCMAP_UniGB_UCS2_V_4, 24,
-     FXCMAP_CMap::None, NULL, 0, -1},
+     FXCMAP_CMap::None, nullptr, 0, -1},
 };
 
 void CPDF_ModuleMgr::LoadEmbeddedGB1CMaps() {