Reduce some fuzzer timeouts

OSS-Fuzz has been fuzzing the HTML parser with inputs up to 1 MB for
several hundred hours without hitting the 20s timeout. It seems that
most timeouts resulting from accidentally quadratic behavior in the
HTML parser have been fixed. Start to gradually reduce the timeout to
find new performance issues.

fuzz/Makefile.am

@@ -74,7 +74,7 @@ fuzz-html: html$(EXEEXT) seed/html.stamp
 	./html$(EXEEXT) \
 	    -dict=html.dict \
 	    -max_len=1000000 \
-	    -timeout=20 \
+	    -timeout=10 \
 	    corpus/html seed/html
 
 # Regexp fuzzer
@@ -99,7 +99,7 @@ fuzz-uri: uri$(EXEEXT)
 	@mkdir -p corpus/uri
 	./uri$(EXEEXT) \
 	    -max_len=10000 \
-	    -timeout=5 \
+	    -timeout=2 \
 	    corpus/uri $(srcdir)/seed/uri
 
 # XML Schema fuzzer

fuzz/html.options

@@ -1,2 +1,2 @@
 [libfuzzer]
-timeout = 20
+timeout = 10

fuzz/uri.options

@@ -1,2 +1,2 @@
 [libfuzzer]
-timeout = 5
+timeout = 2