Use ClearAllFields() when we're disabling.

inspector_network_agent.cc:
This is a behavior change, there are a fair number of fields here.
E.g., previously, the extra headers would be preserved between
disable() and enable(), now they're cleared out.

inspector_page_agent.cc:
Similarly, this is a behavior change.
E.g., previously, setFontFamilies and setFontSizes settings would
be preserved between disable() and enable(), now it's cleared out.

Bug: 851762
Change-Id: I923a2d49ec92f395c5954116e115686517994a0f
Reviewed-on: https://chromium-review.googlesource.com/1161175Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580646}

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

@@ -1322,15 +1322,15 @@ void InspectorNetworkAgent::Enable() {
 
 Response InspectorNetworkAgent::disable() {
   DCHECK(!pending_request_);
-  enabled_.Set(false);
   instrumenting_agents_->removeInspectorNetworkAgent(this);
+  agent_state_.ClearAllFields();
   resources_data_->Clear();
   return Response::OK();
 }
 
 Response InspectorNetworkAgent::setExtraHTTPHeaders(
     std::unique_ptr<protocol::Network::Headers> headers) {
-  extra_request_headers_.ClearAll();
+  extra_request_headers_.Clear();
   std::unique_ptr<protocol::DictionaryValue> in = headers->toValue();
   for (size_t i = 0; i < in->size(); ++i) {
     const auto& entry = in->at(i);
@@ -1389,7 +1389,7 @@ void InspectorNetworkAgent::getResponseBody(
 
 Response InspectorNetworkAgent::setBlockedURLs(
     std::unique_ptr<protocol::Array<String>> urls) {
-  blocked_urls_.ClearAll();
+  blocked_urls_.Clear();
   for (size_t i = 0; i < urls->length(); i++)
     blocked_urls_.Set(urls->get(i), true);
   return Response::OK();

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

@@ -527,8 +527,7 @@ Response InspectorPageAgent::enable() {
 }
 
 Response InspectorPageAgent::disable() {
-  enabled_.Set(false);
-  scripts_to_evaluate_on_load_.ClearAll();
+  agent_state_.ClearAllFields();
   script_to_evaluate_on_load_once_ = String();
   pending_script_to_evaluate_on_load_once_ = String();
   instrumenting_agents_->removeInspectorPageAgent(this);