[Android] Add JavaBridgeBasicsTest#testReplaceJavascriptInterface

[Android] Add JavaBridgeBasicsTest#testReplaceJavascriptInterface

Add a test that replaces previously injected object with a new one
under the same name.

BUG=b/17973356

Committed: https://crrev.com/afd4d54f2f4c20c47b2c3fc9fe51ea4d3761153f
Cr-Commit-Position: refs/heads/master@{#302262}

[mnaganov (inactive), 2014-10-30 17:16:27]

mnaganov@chromium.org changed reviewers:
+ benm@chromium.org

[mnaganov (inactive), 2014-10-30 17:16:28]

I verified with log statements that this use case indeed causes |name| argument
passed to GinJavaBridgeDispatcherHost::RemoveNamedObject to alias the key from
|named_objects_|.

[benm (inactive), 2014-10-31 13:43:19]

lgtm

[mnaganov (inactive), 2014-10-31 13:48:08]

The CQ bit was checked by mnaganov@chromium.org

[commit-bot: I haz the power, 2014-10-31 13:48:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/692933002/1

[commit-bot: I haz the power, 2014-10-31 14:29:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-31 14:30:38]

Patchset 1 (id:??) landed as
https://crrev.com/afd4d54f2f4c20c47b2c3fc9fe51ea4d3761153f
Cr-Commit-Position: refs/heads/master@{#302262}