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These methods will be used to transition the corresponding WebMediaPlayer
methods from using floats to using doubles instead.

BUG=227156
TEST=All tests pass. No change in functionality.


Review URL: https://chromiumcodereview.appspot.com/13431009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192902 0039d316-1c4b-4281-b951-d872f2087c98