Revert "Some changes added to compile and run with Java 6 and Java 7."

 * Breaking build on Linux Mint with OpenJDK 6.
   http://pastebin.com/zciG3W68

This reverts commit 85e22e7ff8f2c3d925b645a88f9b1410307d0f95.

Change-Id: I438c4281654fcb66a317883302527bde3c560125
Update android generator to handle java7.

This is a combination of several commits made
to these files:

https://chromiumcodereview.appspot.com/23587011
https://codereview.chromium.org/23702057
https://codereview.chromium.org/40523002
https://codereview.chromium.org/49913003

Change-Id: Id944decfde8590c3a6e548ac66f598c45de7169e
android_webview: add to support file uploading

This commit changes function from empty implementation
to abstract function interface in AwContentsClient for
supporting uploading file in browser. Its subclass will
override this function. In Android 4.4, browser is based
on chromium not webkit engine, chromium engine support
uploading file and will callback to client to show file
chooser, but android_webview client has empty
implementation within this callback for file chooser.

So we solve this issue by adding implementation in framework
chromium client which extends android_webview client, function
in framework webkit client and corresponding functions in
browser app.

Change-Id: I50375573848879f3c30069b1831b314f0c536163
chromium: clear favicon bitmap prior to load an url

Favicon bitmap reference should be clear before every call to loadUrl. Otherway, webclient
reports the incorrect favicon. Xe: Aosp browser display the old favicon if the new page
doesn't have a favicon, because webview.getFavicon() returns the old bitmap (about:blank page
shouldn't have to have a favicon).

Patchset 2: Better bug code's description comment

Change-Id: I9c41e3b240c4453092428b895556b94fb938e06f
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Webview: Release MediaMetadataRetriever after get media info

- MediaResourceGetter create an object of MediaMetadataRetriever,
  in order to get the duration, width, height of the clip.
- After got enough info, the object should be released.
- Especially in streaming, MediaMetadataRetriever will create a
  connection which will require the data continuously in
  background.

Change-Id: I20dc9f4ca7c38fe7968c78c5b8e2274d6864579d