[devtools] Add find next with Ctrl+G and F3

This cl adds Ctrl+G and F3 as keyboard shortcuts
for windows and linux to find the next occurrence
while a search is open (not necessarily focused).
The default behaviour of Ctrl+G opening the goto
line popup still works as long as the search is not
opened.

Bug: chromium:887586
Change-Id: I8164786778e0b8cb99f7d6ca9d37a61cc34b622b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817887
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#706828}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 40294377601150bd8c37ee375a6cfcdbd01b9630
diff --git a/front_end/main/module.json b/front_end/main/module.json
index 2f51ce7..f162582 100644
--- a/front_end/main/module.json
+++ b/front_end/main/module.json
@@ -185,6 +185,14 @@
                 {
                     "platform": "mac",
                     "shortcut": "Meta+G"
+                },
+                {
+                    "platform": "windows,linux",
+                    "shortcut": "Ctrl+G"
+                },
+                {
+                    "platform": "windows,linux",
+                    "shortcut": "F3"
                 }
             ]
         },
@@ -196,6 +204,14 @@
                 {
                     "platform": "mac",
                     "shortcut": "Meta+Shift+G"
+                },
+                {
+                    "platform": "windows,linux",
+                    "shortcut": "Ctrl+Shift+G"
+                },
+                {
+                    "platform": "windows,linux",
+                    "shortcut": "Shift+F3"
                 }
             ]
         },