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Extract common code from StringPiece and StringPiece16 into a templated base class. Convert copy-and-pasted unit tests into TYPED_TESTs.

The motivation is that I wish to add constructors for string::iterator ranges and I don't want to do it twice.

The motivation for adding the string::iterator range constructors is to reduce the number of overloads in string_number_conversions.h .

BUG=87634
TEST=

Review URL: http://codereview.chromium.org/8659047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114242 0039d316-1c4b-4281-b951-d872f2087c98