Remove patch which has been rolled in from libxml2 upstream.

third_party/libxml/chromium/roll.py

Index: third_party/libxml/chromium/roll.py
diff --git a/third_party/libxml/chromium/roll.py b/third_party/libxml/chromium/roll.py
index f4da100b52d8e7c18fd0480855708533bf425b50..44cac5de8ec8b71c01af72f1e0bfbac8776d65dc 100755
--- a/third_party/libxml/chromium/roll.py
+++ b/third_party/libxml/chromium/roll.py
@@ -75,7 +75,6 @@ PATCHES = [
     'chromium-issue-620679.patch',
     'chromium-issue-628581.patch',
     'chromium-issue-683629.patch',
-    'libxml2-2.9.4-security-CVE-2017-7375-xmlParsePEReference-xxe.patch',
     'libxml2-2.9.4-security-CVE-2017-7376-nanohttp-out-of-bounds-write.patch',
     'libxml2-2.9.4-security-xpath-nodetab-uaf.patch',
     'libxml2-2.9.4-xmlDumpElementContent-null-deref.patch',
@@ -344,8 +343,9 @@ def roll_libxml_linux(src_path, libxml2_repo_path):
                          's/Version: .*$/Version: %s/' % commit)
 
             for patch in PATCHES:
-                subprocess.check_call('cat ../chromium/%s | patch -p1' % patch,
-                                      shell=True)
+                subprocess.check_call(
+                    'cat ../chromium/%s | patch -p1 --fuzz=0' % patch,
+                    shell=True)
 
             with WorkingDir('../linux'):
                 subprocess.check_call(