Combine ComputedStyle default ctor with initial style ctor.
ComputedStyle has two constructors. The default constructor initialises
all the fields and copies the DataRefs from initialStyle(). The other
constructor creates the initial style, which initialises all the fields
and also allocates the memory for each of the DataRefs.
Having two constructors makes it more difficult to maintain and think
about, so this patch removes the default constructor, which can be
implemented instead by copying from the initial style.
BUG=628043
Review-Url: https://codereview.chromium.org/2735283002
Cr-Commit-Position: refs/heads/master@{#456836}
2 files changed
