Moved the TraceUploader to chrome/ and abstracted it for alternative new upload destinations.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 1cc48a8e2d7684113fb0de9af51001e3c4ba4bb4..fbe8214fd2462901e9ebf31f5630974233bfb58a 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -105,6 +105,7 @@ class ResourceContext;
 class ServiceRegistry;
 class SiteInstance;
 class SpeechRecognitionManagerDelegate;
+class TracingDelegate;
 class WebContents;
 class WebContentsViewDelegate;
 struct MainFunctionParams;
@@ -570,6 +571,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   // It's valid to return nullptr.
   virtual DevToolsManagerDelegate* GetDevToolsManagerDelegate();
 
+  // Creates a new TracingDelegate. The caller owns the returned value.
+  // It's valid to return nullptr.
+  virtual TracingDelegate* GetTracingDelegate();
+
   // Returns true if plugin referred to by the url can use
   // pp::FileIO::RequestOSFileHandle.
   virtual bool IsPluginAllowedToCallRequestOSFileHandle(