Only enable speech dispatcher on Linux with an explicit switch.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 100d8443ab03106ad2dd4fffb619a3a3477d35e2..3f049868d1b9241452994fbd1514ffad89e556f3 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1444,6 +1444,7 @@ const char kPasswordStore[]                 = "password-store";
 // and sanity checks are made to avoid corrupting the profile.
 // The browser exits after migration is complete.
 const char kMigrateDataDirForSxS[]          = "migrate-data-dir-for-sxs";
+const char kEnableSpeechDispatcher[] = "enable-speech-dispatcher";

[msw, 2014/03/24 17:11:00]

nit: add a comment briefly explaining what enabling speech dispatcher does, and
why this flag is necessary.

[dmazzoni, 2014/03/24 22:08:42]

Done.

 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
 #if defined(OS_MACOSX)