Enable speech input by default and remove unused code.

content/browser/speech/speech_input_browsertest.cc

Index: content/browser/speech/speech_input_browsertest.cc
diff --git a/content/browser/speech/speech_input_browsertest.cc b/content/browser/speech/speech_input_browsertest.cc
index 8231f3d1a5efbd1c72246e6288aaa7b20b77294a..e28d5bdbad70d01a46e88b073a862554b16e69ca 100644
--- a/content/browser/speech/speech_input_browsertest.cc
+++ b/content/browser/speech/speech_input_browsertest.cc
@@ -98,6 +98,10 @@ class FakeSpeechInputManager : public SpeechInputManager {
 class SpeechInputBrowserTest : public InProcessBrowserTest {
  public:
   // InProcessBrowserTest methods
+  virtual void SetUpCommandLine(CommandLine* command_line) {
+    EXPECT_TRUE(!command_line->HasSwitch(switches::kDisableSpeechInput));
+  }
+
   GURL testUrl(const FilePath::CharType* filename) {
     const FilePath kTestDir(FILE_PATH_LITERAL("speech"));
     return ui_test_utils::GetTestUrl(kTestDir, FilePath(filename));