Refactor OriginTrialPolicy to be an abstract interface in content/public/common

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index f4414936e8e0e89a3495aec4073693e75ea35484..a476bd4a89b76c140cb658dae7806b95ddd8d047 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -700,8 +700,19 @@ bool ChromeContentClient::IsSupplementarySiteIsolationModeEnabled() {
 #endif
 }
 
-base::StringPiece ChromeContentClient::GetOriginTrialPublicKey() {
-  return origin_trial_key_manager_.GetPublicKey();
+void ChromeContentClient::InitializeOriginTrialPolicy() {
+  // Set the public key for the origin trial key manager, based on the command
+  // line flags which were passed to this process.
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kOriginTrialPublicKey)) {
+    origin_trial_policy_.SetPublicKeyFromASCIIString(
+        command_line->GetSwitchValueASCII(switches::kOriginTrialPublicKey));
+  }
+}
+
+const content::OriginTrialPolicy* ChromeContentClient::GetOriginTrialPolicy()
+    const {
+  return &origin_trial_policy_;
 }
 
 #if defined(OS_ANDROID)