Change how ui::Clipboard is accessed so there's only one per thread.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index b31ae0a7c137020b878429a5ae4546660df2d64b..bc5a56bc94bc309631a0bbd0a0366963ac5e26f3 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -71,10 +71,6 @@ namespace safe_browsing {
 class ClientSideDetectionService;
 }
 
-namespace ui {
-class Clipboard;
-}
-
 // NOT THREAD SAFE, call only from the main thread.
 // These functions shouldn't return NULL unless otherwise noted.
 class BrowserProcess {
@@ -95,7 +91,6 @@ class BrowserProcess {
   virtual MetricsService* metrics_service() = 0;
   virtual ProfileManager* profile_manager() = 0;
   virtual PrefService* local_state() = 0;
-  virtual ui::Clipboard* clipboard() = 0;
   virtual net::URLRequestContextGetter* system_request_context() = 0;
   virtual chrome_variations::VariationsService* variations_service() = 0;