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

BUG=pdfium:603

Review-Url: https://codereview.chromium.org/2386423004
diff --git a/fpdfsdk/cpdfsdk_pageview.h b/fpdfsdk/cpdfsdk_pageview.h
index f837ba5..f29af70 100644
--- a/fpdfsdk/cpdfsdk_pageview.h
+++ b/fpdfsdk/cpdfsdk_pageview.h
@@ -10,7 +10,7 @@
 #include <memory>
 #include <vector>
 
-#include "core/fpdfapi/fpdf_page/cpdf_page.h"
+#include "core/fpdfapi/page/cpdf_page.h"
 #include "core/fxcrt/fx_system.h"
 #include "fpdfsdk/cpdfsdk_annot.h"
 #include "fpdfsdk/cpdfsdk_document.h"