[libfuzzer] Fix escaping of quotes in dictionary_generator.py and dicts affected.

testing/libfuzzer/dictionary_generator.py

Index: testing/libfuzzer/dictionary_generator.py
diff --git a/testing/libfuzzer/dictionary_generator.py b/testing/libfuzzer/dictionary_generator.py
index 7133cfa5c2b078593ddac88805bcdb95d10d9b76..b720e8e755be6442e737663a4ff4f1eb16dd22d9 100755
--- a/testing/libfuzzer/dictionary_generator.py
+++ b/testing/libfuzzer/dictionary_generator.py
@@ -36,7 +36,12 @@ def DecodeHTML(html_data):
 
 def EscapeDictionaryElement(element):
   """Escape all unprintable and control characters in an element."""
-  return element.encode('string_escape').replace('"', '\"')
+  element_escaped = element.encode('string_escape')
+  # Remove escaping for single quote because it breaks libFuzzer.
+  element_escaped = element_escaped.replace('\\\'', '\'')
+  # Add escaping for double quote.
+  element_escaped = element_escaped.replace('"', '\\"')
+  return element_escaped
 
 
 def ExtractWordsFromBinary(filepath, min_length=MIN_STRING_LENGTH):