Updated to most recent version RE2 and remove upstreamed patches.

third_party/re2/doc/syntax.txt

Index: third_party/re2/doc/syntax.txt
diff --git a/third_party/re2/doc/syntax.txt b/third_party/re2/doc/syntax.txt
index 740e5ce34684a80ec0190ab31df852dfc83aa06a..f940750980a68e4d6f8f99affec2274dae86ed27 100644
--- a/third_party/re2/doc/syntax.txt
+++ b/third_party/re2/doc/syntax.txt
@@ -2,7 +2,7 @@ RE2 regular expression syntax reference
 -------------------------­-------­-----
 
 Single characters:
-.	any character, including newline (s=true)
+.	any character, possibly including newline (s=true)
 [xyz]	character class
 [^xyz]	negated character class
 \d	Perl character class
@@ -60,7 +60,7 @@ re@>	possessive match of «re» NOT SUPPORTED vim
 
 Flags:
 i	case-insensitive (default false)
-m	multi-line mode: ^ and $ match begin/end line in addition to begin/end text (default false)
+m	multi-line mode: «^» and «$» match begin/end line in addition to begin/end text (default false)
 s	let «.» match «\n» (default false)
 U	ungreedy: swap meaning of «x*» and «x*?», «x+» and «x+?», etc (default false)
 Flag syntax is «xyz» (set) or «-xyz» (clear) or «xy-z» (set «xy», clear «z»).