Fix hideHighlight

ClearInspectTool was not clearing inspect_tool_ in the expected
order (DisableFrameOverlay checks inspect_tool_ via IsVisible method),
thus, breaking hideHighlight functionality. This was broken
in https://crrev.com/c/2397735

Fixed: 1136455
Change-Id: I97dc444cffee98cb41a8ac8285f4e7d0cc797715
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460732
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815147}

third_party/blink/renderer/core/inspector/inspector_overlay_agent.cc

@@ -1357,9 +1357,9 @@ void InspectorOverlayAgent::EnsureEnableFrameOverlay() {
 }
 
 void InspectorOverlayAgent::ClearInspectTool() {
+  inspect_tool_ = nullptr;
   if (!hinge_)
     DisableFrameOverlay();
-  inspect_tool_ = nullptr;
 }
 
 Response InspectorOverlayAgent::SetInspectTool(InspectTool* inspect_tool) {