[Cleanup] Update histogram_tester.h includes in //chrome

Update all histogram_tester.h includes in //chrome to include
//base/test/metrics/histogram_tester.h

Bug: 846421
Change-Id: I29892fe715a6c5930c001d57936a92f92c8ab6a9
Reviewed-on: https://chromium-review.googlesource.com/1081341
Reviewed-by: Lei Zhang <[email protected]>
Commit-Queue: Devlin <[email protected]>
Cr-Commit-Position: refs/heads/master@{#563469}
diff --git a/chrome/browser/extensions/process_manager_browsertest.cc b/chrome/browser/extensions/process_manager_browsertest.cc
index 4a770b0..44bd85a 100644
--- a/chrome/browser/extensions/process_manager_browsertest.cc
+++ b/chrome/browser/extensions/process_manager_browsertest.cc
@@ -12,7 +12,7 @@
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/test/histogram_tester.h"
+#include "base/test/metrics/histogram_tester.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_browsertest.h"