Remove Browser

Browser is deprecated. It's being replaced by 3 components:
- Chromium, a.k.a. ChromePublic, which is not included in AOSP and must
be built separately. See packages/apps/Browser2/README.
- Browser2, a tiny, WebView-based test browser copied from Chromium's
WebViewShell.
- BookmarkProvider, which takes over the "com.android.browser;browser"
authorities and returns empty Cursors for all queries. Bookmark access
is removed in the M permission model.
BUG:19351071

default.xml

@@ -378,7 +378,6 @@
   <project path="ndk" name="platform/ndk" />
   <project path="packages/apps/BasicSmsReceiver" name="platform/packages/apps/BasicSmsReceiver" />
   <project path="packages/apps/Bluetooth" name="platform/packages/apps/Bluetooth" groups="pdk-cw-fs" />
-  <project path="packages/apps/Browser" name="platform/packages/apps/Browser" />
   <project path="packages/apps/Browser2" name="platform/packages/apps/Browser2" />
   <project path="packages/apps/Calculator" name="platform/packages/apps/Calculator" />
   <project path="packages/apps/Calendar" name="platform/packages/apps/Calendar" />