Switch Platform::WebRtcStunProbeTrialParameter() away from std::string

... to use WebString instead.

BUG=78725
R=haraken@chromium.org

Change-Id: I7328edc399980f5b1105d07657c463cb1ac3f1d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988291
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728533}

content/renderer/renderer_blink_platform_impl.cc

@@ -568,14 +568,14 @@ bool RendererBlinkPlatformImpl::IsWebRtcStunOriginEnabled() {
       switches::kEnableWebRtcStunOrigin);
 }
 
-base::Optional<std::string>
+base::Optional<blink::WebString>
 RendererBlinkPlatformImpl::WebRtcStunProbeTrialParameter() {
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   if (!cmd_line->HasSwitch(switches::kWebRtcStunProbeTrialParameter))
     return base::nullopt;
 
-  return cmd_line->GetSwitchValueASCII(
-      switches::kWebRtcStunProbeTrialParameter);
+  return blink::WebString::FromASCII(
+      cmd_line->GetSwitchValueASCII(switches::kWebRtcStunProbeTrialParameter));
 }
 
 media::MediaPermission* RendererBlinkPlatformImpl::GetWebRTCMediaPermission(

content/renderer/renderer_blink_platform_impl.h

@@ -137,7 +137,7 @@ class CONTENT_EXPORT RendererBlinkPlatformImpl : public BlinkPlatformImpl {
   bool UsesFakeCodecForPeerConnection() override;
   bool IsWebRtcEncryptionEnabled() override;
   bool IsWebRtcStunOriginEnabled() override;
-  base::Optional<std::string> WebRtcStunProbeTrialParameter() override;
+  base::Optional<blink::WebString> WebRtcStunProbeTrialParameter() override;
   media::MediaPermission* GetWebRTCMediaPermission(
       blink::WebLocalFrame* web_frame) override;
   void GetWebRTCRendererPreferences(blink::WebLocalFrame* web_frame,

third_party/blink/public/platform/platform.h

@@ -578,7 +578,7 @@ class BLINK_PLATFORM_EXPORT Platform {
 
   virtual bool IsWebRtcSrtpEncryptedHeadersEnabled() { return false; }
 
-  virtual base::Optional<std::string> WebRtcStunProbeTrialParameter() {
+  virtual base::Optional<WebString> WebRtcStunProbeTrialParameter() {
     return base::nullopt;
   }
 

third_party/blink/renderer/modules/peerconnection/peer_connection_dependency_factory.cc

@@ -541,8 +541,8 @@ void PeerConnectionDependencyFactory::InitializeWorkerThread(
 }
 
 void PeerConnectionDependencyFactory::TryScheduleStunProbeTrial() {
-  base::Optional<std::string> params =
-      blink::Platform::Current()->WebRtcStunProbeTrialParameter();
+  base::Optional<WebString> params =
+      Platform::Current()->WebRtcStunProbeTrialParameter();
   if (!params)
     return;
 
@@ -552,7 +552,7 @@ void PeerConnectionDependencyFactory::TryScheduleStunProbeTrial() {
       *chrome_worker_thread_.task_runner().get(), FROM_HERE,
       CrossThreadBindOnce(
           &PeerConnectionDependencyFactory::StartStunProbeTrialOnWorkerThread,
-          CrossThreadUnretained(this), String::FromUTF8(*params)),
+          CrossThreadUnretained(this), String(*params)),
       base::TimeDelta::FromMilliseconds(blink::kExperimentStartDelayMs));
 }