This tries to remove includes of "-inl.h" headers from normal ".h"
headers, thereby reducing the chance of any cyclic dependencies and
decreasing the average size of our compilation units.

Note that this change still leaves 7 violations of that rule in the
code. However there now is the "tools/check-inline-includes.sh" tool
detecting such violations.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1283033003

Cr-Commit-Position: refs/heads/master@{#30125}