Previously, long file names would display outside of the window size,
causing a horizontal scroll on mobile browsers.
With this change:
* In the file list on the change view, the rightControls are adjusted so
that they wrap on a new line on smaller/mobile screens.
* In the comment list, word-wrapping is used for long file paths
displayed above each comment.
* In the diff view, instead of displaying full paths in the dropdown,
the path is truncated to include an ellipsis, a slash and the file name
so that it can be seen both in the dropdown and also the native browser
select.
Bug: Issue 4722
Change-Id: Icd4644a45db71bc6666c21d62c864d91e9874654
6c06e78cf6