Enable speech input by default and remove unused code.

chrome/browser/speech/speech_input_browsertest.cc

Index: chrome/browser/speech/speech_input_browsertest.cc
diff --git a/chrome/browser/speech/speech_input_browsertest.cc b/chrome/browser/speech/speech_input_browsertest.cc
index 05dd4f6499b905c840255195769a47f87482491d..1fb648af7a728f3a988712d2cf945aa4dadaf7c6 100644
--- a/chrome/browser/speech/speech_input_browsertest.cc
+++ b/chrome/browser/speech/speech_input_browsertest.cc
@@ -94,6 +94,10 @@ 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));