translate includes in brotli/research

PiperOrigin-RevId: 712842974

research/deorummolae.cc

diff --git a/research/deorummolae.cc b/research/deorummolae.cc
index e5716cf..81e5685 100644
--- a/research/deorummolae.cc
+++ b/research/deorummolae.cc
@@ -3,7 +3,7 @@
 #include <array>
 #include <cstdio>
 
-#include "third_party/esaxx/sais.hxx"
+#include <sais.hxx>
 
 #if defined(_MSC_VER)
 #include <intrin.h>  /* __popcnt64 */

research/durchschlag.cc

diff --git a/research/durchschlag.cc b/research/durchschlag.cc
index bae50df..1a23a39 100644
--- a/research/durchschlag.cc
+++ b/research/durchschlag.cc
@@ -3,7 +3,7 @@
 #include <algorithm>
 #include <exception>  /* terminate */
 
-#include "third_party/libdivsufsort/include/divsufsort.h"
+#include <divsufsort.h>
 
 /* Pointer to position in text. */
 typedef DurchschlagTextIdx TextIdx;

research/find_opt_references.cc

diff --git a/research/find_opt_references.cc b/research/find_opt_references.cc
index 96abce4..32c4ddc 100644
--- a/research/find_opt_references.cc
+++ b/research/find_opt_references.cc
@@ -20,7 +20,7 @@
 using gflags::ParseCommandLineFlags;
 
 #include "third_party/absl/flags/flag.h"
-#include "third_party/esaxx/sais.hxx"
+#include <sais.hxx>
 
 DEFINE_bool(advanced, false, "Advanced searching mode: finds all longest "
     "matches at positions that are not covered by matches of length at least "