Cleanup: Remove unused variables in chrome/ found by Scythe.

chrome/browser/speech/tts_message_filter.cc

Index: chrome/browser/speech/tts_message_filter.cc
diff --git a/chrome/browser/speech/tts_message_filter.cc b/chrome/browser/speech/tts_message_filter.cc
index 8174e604c0925a905fdb995aec03bd96b75b02d7..764e50410ca06f3988fb89a2409b030b34c04985 100644
--- a/chrome/browser/speech/tts_message_filter.cc
+++ b/chrome/browser/speech/tts_message_filter.cc
@@ -14,10 +14,8 @@
 
 using content::BrowserThread;
 
-TtsMessageFilter::TtsMessageFilter(int render_process_id,
-                                   content::BrowserContext* browser_context)
+TtsMessageFilter::TtsMessageFilter(content::BrowserContext* browser_context)
     : BrowserMessageFilter(TtsMsgStart),
-      render_process_id_(render_process_id),
       browser_context_(browser_context),
       valid_(true) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));