Remove FX_BOOL from xfa.

Review-Url: https://codereview.chromium.org/2467203003
diff --git a/xfa/fxgraphics/cfx_path.cpp b/xfa/fxgraphics/cfx_path.cpp
index e4fb727..d02b7a8 100644
--- a/xfa/fxgraphics/cfx_path.cpp
+++ b/xfa/fxgraphics/cfx_path.cpp
@@ -162,12 +162,12 @@
   return FWL_Error::Succeeded;
 }
 
-FX_BOOL CFX_Path::IsEmpty() const {
+bool CFX_Path::IsEmpty() const {
   if (!m_generator)
-    return FALSE;
+    return false;
   if (m_generator->GetPathData()->GetPointCount() == 0)
-    return TRUE;
-  return FALSE;
+    return true;
+  return false;
 }
 
 CFX_PathData* CFX_Path::GetPathData() const {