Merge to XFA: Fix all relative includes to third_party.

- In non-standalone builds, use the provided jpeg library.
- Run gn format over all the GN files.
- Also roll DEPS for buildtools to c2f2598.
- And fix XFA's lack of #includes.

BUG=541704
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1425153006 .

(cherry picked from commit 34bb6c58fe60206a08dc0a1f37b7cfe83e8c762c)

Review URL: https://codereview.chromium.org/1434543003 .
diff --git a/samples/image_diff.cc b/samples/image_diff.cc
index f10bd31..88a3956 100644
--- a/samples/image_diff.cc
+++ b/samples/image_diff.cc
@@ -19,9 +19,9 @@
 #include <string>
 #include <vector>
 
-#include "../third_party/base/logging.h"
-#include "../third_party/base/numerics/safe_conversions.h"
 #include "image_diff_png.h"
+#include "third_party/base/logging.h"
+#include "third_party/base/numerics/safe_conversions.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
diff --git a/samples/image_diff_png.cc b/samples/image_diff_png.cc
index a8ca925..992617d 100644
--- a/samples/image_diff_png.cc
+++ b/samples/image_diff_png.cc
@@ -16,9 +16,9 @@
 
 #include <string>
 
-#include "../third_party/base/logging.h"
-#include "../third_party/lpng_v163/png.h"
-#include "../third_party/zlib_v128/zlib.h"
+#include "third_party/base/logging.h"
+#include "third_party/lpng_v163/png.h"
+#include "third_party/zlib_v128/zlib.h"
 
 namespace image_diff_png {
 
diff --git a/samples/pdfium_test.cc b/samples/pdfium_test.cc
index 4ccf1a7..190286a 100644
--- a/samples/pdfium_test.cc
+++ b/samples/pdfium_test.cc
@@ -25,7 +25,7 @@
 #ifdef PDF_ENABLE_V8
 #include "v8/include/libplatform/libplatform.h"
 #include "v8/include/v8.h"
-#endif
+#endif  // PDF_ENABLE_V8
 
 #ifdef _WIN32
 #define snprintf _snprintf
diff --git a/samples/samples.gyp b/samples/samples.gyp
index 97181ba..ff7b058 100644
--- a/samples/samples.gyp
+++ b/samples/samples.gyp
@@ -15,6 +15,7 @@
     'include_dirs': [
       # This is implicit in GN.
       '<(DEPTH)',
+      '..',
     ],
     'conditions': [
       ['pdf_enable_v8==1', {