Revert "Converting (Alt+LeftClick -> RightClick) to (Search+LeftClick -> RightClick)"

Revert "Converting (Alt+LeftClick -> RightClick) to (Search+LeftClick -> RightClick)" on behalf of afakhry@.

As seen in the buganizer discussion, users have gotten used to the broken behavior and are disrupted by the change without warning.

This reverts commit 404d0118fa4c40676cbd2f6da3e5ba5d62f39b61.

BUG=248762
TBR=afakhry@chromium.org

Committed: https://crrev.com/e54b1fc21cb1fbb5f4532009ad8181432761657c
Cr-Commit-Position: refs/heads/master@{#332979}

[xdai1, 2015-06-05 00:52:56]

The CQ bit was checked by xdai@chromium.org

[commit-bot: I haz the power, 2015-06-05 00:53:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161853004/1

[commit-bot: I haz the power, 2015-06-05 00:59:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-05 01:01:50]

Patchset 1 (id:??) landed as
https://crrev.com/e54b1fc21cb1fbb5f4532009ad8181432761657c
Cr-Commit-Position: refs/heads/master@{#332979}