Fix more symbol exports and a compile failure for the component build of

content/browser/browser_process_sub_thread.h

Index: content/browser/browser_process_sub_thread.h
diff --git a/content/browser/browser_process_sub_thread.h b/content/browser/browser_process_sub_thread.h
index 55978e68b939da6b1694cd28335acea23d58beef..73442fcd9d0b87842cff52ce2e31dae232064a78 100644
--- a/content/browser/browser_process_sub_thread.h
+++ b/content/browser/browser_process_sub_thread.h
@@ -8,6 +8,7 @@
 
 #include "base/basictypes.h"
 #include "content/browser/browser_thread.h"
+#include "content/common/content_export.h"
 
 class NotificationService;
 
@@ -20,7 +21,7 @@ class NotificationService;
 // Applications must initialize the COM library before they can call
 // COM library functions other than CoGetMalloc and memory allocation
 // functions, so this class initializes COM for those users.
-class BrowserProcessSubThread : public BrowserThread {
+class CONTENT_EXPORT BrowserProcessSubThread : public BrowserThread {
  public:
   explicit BrowserProcessSubThread(BrowserThread::ID identifier);
   virtual ~BrowserProcessSubThread();