[ios][PhishGuard] Extract SetReferringAppInfo

This CL makes it easier/clearer to split up PasswordProtectionRequest
in a future CL.

Android-only code that depends on WebContents is extracted to a
standalone method - SetReferringAppInfo.
The content derived class implementation of
PasswordProtectionRequest will have access to WebContents and the
method will be moved there in a future CL.

Bug: 1147967
Change-Id: Ic38c933cb8d633bbef77c7b36460aa140bc55a87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637403
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845492}

components/safe_browsing/content/password_protection/password_protection_request.cc

@@ -278,18 +278,7 @@ void PasswordProtectionRequest::FillRequestProto(bool is_sampled_ping) {
 #endif  // BUILDFLAG(FULL_SAFE_BROWSING)
 
 #if defined(OS_ANDROID)
-  if (base::FeatureList::IsEnabled(
-          safe_browsing::kPasswordProtectionReferringAppEnabledAndroid)) {
-    LoginReputationClientRequest::ReferringAppInfo referring_app_info =
-        password_protection_service_->GetReferringAppInfo(web_contents_);
-    UMA_HISTOGRAM_ENUMERATION(
-        "PasswordProtection.RequestReferringAppSource",
-        referring_app_info.referring_app_source(),
-        LoginReputationClientRequest::ReferringAppInfo::ReferringAppSource_MAX +
-            1);
-    *request_proto_->mutable_referring_app_info() =
-        std::move(referring_app_info);
-  }
+  SetReferringAppInfo();
 #endif  // defined(OS_ANDROID)
 
   switch (trigger_type_) {
@@ -650,4 +639,17 @@ void PasswordProtectionRequest::HandleDeferredNavigations() {
   throttles_.clear();
 }
 
+#if defined(OS_ANDROID)
+void PasswordProtectionRequest::SetReferringAppInfo() {
+  LoginReputationClientRequest::ReferringAppInfo referring_app_info =
+      password_protection_service_->GetReferringAppInfo(web_contents_);
+  UMA_HISTOGRAM_ENUMERATION(
+      "PasswordProtection.RequestReferringAppSource",
+      referring_app_info.referring_app_source(),
+      LoginReputationClientRequest::ReferringAppInfo::ReferringAppSource_MAX +
+          1);
+  *request_proto_->mutable_referring_app_info() = std::move(referring_app_info);
+}
+#endif  // defined(OS_ANDROID)
+
 }  // namespace safe_browsing

components/safe_browsing/content/password_protection/password_protection_request.h

@@ -224,6 +224,11 @@ class PasswordProtectionRequest
       std::unique_ptr<VisualFeatures> visual_features);
 #endif  // BUILDFLAG(FULL_SAFE_BROWSING)
 
+#if defined(OS_ANDROID)
+  // Sets the referring app info.
+  void SetReferringAppInfo();
+#endif  // defined(OS_ANDROID)
+
   // Initiates network request to Safe Browsing backend.
   void SendRequest();