Becky Siegel 8b60a5100b Fix links in gr-diff showContext buttons
Previously, when gr-diff-builder generated context buttons, it reset the
textContent after gr-button was created. This ended up removing the
paper-button from inside gr-button, and hence lost all button like
qualities.

This change replaces with the appropriate Polymer DOM API, and modifies
the gr-button styles accordingly.

Bug: Issue 8626
Change-Id: Ic9a33c6bc74d676b21a039dd8714e4001bcda207
2018-03-26 14:47:01 -07:00
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