Use WebLocalFrame::isLoading(), not WebFrame::isLoading(), in print preview.

Use WebLocalFrame::isLoading(), not WebFrame::isLoading(), in print preview.

This was changed in the normal chromium print_preview_web_helper.cc in
02cfd5ccc819ce649db8ff032d43fb16ee3167d9, but I missed the need to change it
in android's print_preview_web_helper.cc. This will allow isLoading() to live
solely on WebLocalFrame, as it doesn't make sense in a remote frame.

BUG=

Committed: https://crrev.com/8ef0627a42fd6a5b07bb16e33a5766673e7bf1d7
Cr-Commit-Position: refs/heads/master@{#294022}

[Nate Chapin, 2014-09-09 17:26:56]

japhet@chromium.org changed reviewers:
+ boliu@chromium.org

[Nate Chapin, 2014-09-09 17:26:57]

boliu, would you mind reviewing this simple 1-liner?

[boliu, 2014-09-09 17:28:59]

lgtm

[Nate Chapin, 2014-09-09 17:31:53]

The CQ bit was checked by japhet@chromium.org

[commit-bot: I haz the power, 2014-09-09 17:33:23]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/japhet@chromium.org/556923002/1

[commit-bot: I haz the power, 2014-09-09 20:03:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-09 20:03:15]

Try jobs failed on following builders:
  android_dbg_tests_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_dbg_tes...)

[Nate Chapin, 2014-09-09 20:04:23]

The CQ bit was checked by japhet@chromium.org

[commit-bot: I haz the power, 2014-09-09 20:14:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/japhet@chromium.org/556923002/1

[commit-bot: I haz the power, 2014-09-09 22:44:24]

Committed patchset #1 (id:1) as 8064a7b4bc3756e4a916a98cbad3f4e15ba233ee

[commit-bot: I haz the power, 2014-09-10 03:56:06]

Patchset 1 (id:??) landed as
https://crrev.com/8ef0627a42fd6a5b07bb16e33a5766673e7bf1d7
Cr-Commit-Position: refs/heads/master@{#294022}