Fix a renderer crash when dragging quickly over tab contents.

Fix a renderer crash when dragging quickly over tab contents.

We were expecting to receive GTK+ events in the following order:
  drag-motion
  drag-data-received
  drag-leave
but in some cases, we don't get the drag-data-received event (e.g.,
if the user is moving the mouse quickly). If that happens, don't send
a DragLeave event to the renderer since it doesn't think we're in a
drag.

BUG=129446
TEST=Open 2 chrome windows, quickly drag a file from the desktop over both
  windows. This should not crash.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=146016

[tony, 2012-07-10 22:47:33]

I don't like adding another bool just for this, but I can't think of a simpler
way to do this.

[dcheng, 2012-07-10 22:49:00]

Would checking data_requests_ > 0 be equivalent to the new bool?

[tony, 2012-07-10 22:56:19]

On 2012/07/10 22:49:00, dcheng wrote:
> Would checking data_requests_ > 0 be equivalent to the new bool?

Yes, that's much better!

[dcheng, 2012-07-10 22:58:41]

lgtm

[tony, 2012-07-10 23:01:01]

+OWNERS

[jam, 2012-07-10 23:50:57]

lgtm

[commit-bot: I haz the power, 2012-07-10 23:55:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tony@chromium.org/10704144/4001

[commit-bot: I haz the power, 2012-07-11 00:58:42]

Change committed as 146016