Update V8 version to 7.1

TBR=machenbach@chromium.org, hablich@chromium.org
NOTRY=true

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I8c5fc76a3d16428c2495c23ef0529569a927a8c9
Reviewed-on: https://chromium-review.googlesource.com/1196443
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55516}

include/v8-version.h

@@ -9,7 +9,7 @@
 // NOTE these macros are used by some of the tool scripts and the build
 // system so their names cannot be changed without changing the scripts.
 #define V8_MAJOR_VERSION 7
-#define V8_MINOR_VERSION 0
+#define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 0
 #define V8_PATCH_LEVEL 0