Move core/fpdfapi/fpdf_page to core/fpdfapi/page

BUG=pdfium:603

Review-Url: https://codereview.chromium.org/2386423004
diff --git a/fpdfsdk/cpdfsdk_interform.cpp b/fpdfsdk/cpdfsdk_interform.cpp
index 855dc96..a5f3f12 100644
--- a/fpdfsdk/cpdfsdk_interform.cpp
+++ b/fpdfsdk/cpdfsdk_interform.cpp
@@ -10,11 +10,11 @@
 #include <memory>
 #include <vector>
 
-#include "core/fpdfapi/fpdf_page/cpdf_page.h"
 #include "core/fpdfapi/fpdf_parser/cfdf_document.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_document.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_stream.h"
+#include "core/fpdfapi/page/cpdf_page.h"
 #include "core/fpdfdoc/cpdf_actionfields.h"
 #include "core/fpdfdoc/cpdf_interform.h"
 #include "core/fxge/cfx_graphstatedata.h"