Fix a few more warnings in chromium_code mode.

core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp
index 5e8c1b5ec3b2aa33cb1634f72994599e3be9ab4c..7d8bd4842aeaadf3a3f9d78f30c59af219ea510f 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp
@@ -619,11 +619,9 @@ void CPDF_StreamContentParser::Handle_ConcatMatrix()
 {
     FX_FLOAT a2 = GetNumber16(5), b2 = GetNumber16(4), c2 = GetNumber16(3), d2 = GetNumber16(2);
     FX_FLOAT e2 = GetNumber(1), f2 = GetNumber(0);
-    FX_FLOAT old_width_scale = m_pCurStates->m_CTM.GetXUnit();
     CFX_AffineMatrix new_matrix(a2, b2, c2, d2, e2, f2);
     new_matrix.Concat(m_pCurStates->m_CTM);
     m_pCurStates->m_CTM = new_matrix;
-    FX_FLOAT new_width_scale = m_pCurStates->m_CTM.GetXUnit();
     OnChangeTextMatrix();
 }
 void CPDF_StreamContentParser::Handle_SetColorSpace_Fill()