Since we're only using it on Linux now, just require poppler as a system dependency.

third_party/poppler/README.chromium

Index: third_party/poppler/README.chromium
diff --git a/third_party/poppler/README.chromium b/third_party/poppler/README.chromium
deleted file mode 100644
index 150023cee3301de72c97cba661c51138c6fef937..0000000000000000000000000000000000000000
--- a/third_party/poppler/README.chromium
+++ /dev/null
@@ -1,34 +0,0 @@
-Name: libpoppler
-Short Name: libpoppler
-URL: git://git.freedesktop.org/git/poppler/poppler
-Version: 0.22.5
-License: GPLv2 / GPLv3
-License File: NOT_SHIPPED
-Security Critical: No
-
-Description:
-A PDF rendering library, currently used in the Skia gm for regression
-testing PDF output.
-This should ONLY be used for testing code.
-
-Local Modifications:
-No changes to files from the upstream repository.
-
-Platform-specific configuration files added to
-third_party/poppler/config/(platform):
-  config.h
-  poppler/poppler-config.h
-
-Autogenerated files (consistent across platforms) added to
-third_party/poppler:
-  cpp/poppler-version.h
-
-On Linux and Mac, these are the files generated by ./configure, using these
-flags:
---disable-libopenjpeg --disable-libtiff --disable-largefile
---disable-libjpeg --disable-libpng --disable-cairo-output
---disable-poppler-glib --disable-poppler-qt4 --disable-gtk-test
---disable-utils 
-On Windows, these are the files generated with CMake and selecting a minimal
-feature set.
-