Remove some stray check_op.h includes

e.g. grep -L 'CHECK_' `git grep -l check_op.h` should be clean.

Change-Id: Iad9d304707044b4a9cca9ec76927bb93ae6bc202
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/93612
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Auto-Submit: Tom Sepez <tsepez@chromium.org>
diff --git a/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp b/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp
index ee9a916..dee3a7c 100644
--- a/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp
+++ b/fpdfsdk/formfiller/cffl_interactiveformfiller.cpp
@@ -24,7 +24,6 @@
 #include "fpdfsdk/formfiller/cffl_textfield.h"
 #include "public/fpdf_fwlevent.h"
 #include "third_party/base/check.h"
-#include "third_party/base/check_op.h"
 #include "third_party/base/cxx17_backports.h"
 
 CFFL_InteractiveFormFiller::CFFL_InteractiveFormFiller(
diff --git a/testing/string_write_stream.cpp b/testing/string_write_stream.cpp
index f35930b..a4a0947 100644
--- a/testing/string_write_stream.cpp
+++ b/testing/string_write_stream.cpp
@@ -6,7 +6,6 @@
 
 #include "core/fxcrt/bytestring.h"
 #include "core/fxcrt/widestring.h"
-#include "third_party/base/check_op.h"
 
 StringWriteStream::StringWriteStream() = default;