Clear omnibox when pressing search key.

Fix for http://b/issue?id=2442426

No longer override onSearchRequested, so that pressing the search
key behaves normally.  For touching the title bar, use the old
onSearchRequested (renamed to editUrl).
diff --git a/src/com/android/browser/TitleBar.java b/src/com/android/browser/TitleBar.java
index 844d5a1..15b1d44 100644
--- a/src/com/android/browser/TitleBar.java
+++ b/src/com/android/browser/TitleBar.java
@@ -220,7 +220,7 @@
                         mBrowserActivity.showVoiceSearchResults(
                                 mTitle.getText().toString().trim());
                     } else {
-                        mBrowserActivity.onSearchRequested();
+                        mBrowserActivity.editUrl();
                     }
                     mTitleBg.setPressed(false);
                 }