Adding default_exe_manifest to two binaries
Adding default_exe_manifest to two binaries

gn builds are missing Windows manifests for pdfium_diff.exe and
pdfium_test.exe. These manifests are necessary in order to get
predictable behavior on Windows.

BUG=602505

Review-Url: https://codereview.chromium.org/1927593003

DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium