Use <meta-data> tag instead of intent filter data to detect supported payment methods.

Design doc:
https://docs.google.com/document/d/1izV4uC-tiRJG3JLooqY3YRLU22tYOsLTNq0P_InPJeE

To test:
1) Install BobPayWithMetaData.apk from
 https://drive.google.com/a/google.com/file/d/0B3ISiXgGE1MNSllxOWtTU0U0TDQ/view?usp=sharing
2) Enable chrome://flags/#android-payment-apps.
3) Navigate to https://rsolomakhin.github.io/pr/bob/.
4) Click "Buy" button on the webpage.

BUG=707246

Review-Url: https://codereview.chromium.org/2793573002
Cr-Commit-Position: refs/heads/master@{#461274}
3 files changed