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 d2ae7a0dd59c07dd4157d4eb2683965cb4bb539e..666cc913bbb6911ae9932a3064af84621de7eefb 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -104,6 +104,7 @@ class RenderViewHost;
 class ResourceContext;
 class ServiceRegistry;
 class SiteInstance;
+class TracingDelegate;
 class SpeechRecognitionManagerDelegate;
 class WebContents;
 class WebContentsViewDelegate;
@@ -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(