Remove user activation trigger from DevToolsHost.

It's not clear why this had been added originally 9+ years ago.
No longer needed with UAv2.

Bug: 959850
Change-Id: I597809c023d1f1b382a27fdca6823ce540b45a7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875284Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709233}

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

@@ -36,7 +36,6 @@
 #include "third_party/blink/renderer/core/clipboard/system_clipboard.h"
 #include "third_party/blink/renderer/core/dom/events/event.h"
 #include "third_party/blink/renderer/core/dom/events/event_target.h"
-#include "third_party/blink/renderer/core/dom/user_gesture_indicator.h"
 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
 #include "third_party/blink/renderer/core/frame/local_dom_window.h"
 #include "third_party/blink/renderer/core/frame/local_frame.h"
@@ -126,8 +125,6 @@ void DevToolsHost::EvaluateScript(const String& expression) {
   if (!script_state)
     return;
   ScriptState::Scope scope(script_state);
-  std::unique_ptr<UserGestureIndicator> gesture_indicator =
-      LocalFrame::NotifyUserActivation(frontend_frame_);
   v8::MicrotasksScope microtasks(script_state->GetIsolate(),
                                  v8::MicrotasksScope::kRunMicrotasks);
   ScriptSourceCode source_code(expression, ScriptSourceLocationType::kInternal,