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This warns on code of the form:
#endif RANDOM_TEXT
MIDL generated code tends to emit code in this pattern, so suppress
this warning when compiling MIDL generated files.

BUG=504663
R=thakis@chromium.org
TBR=dtseng, robertshield, weitaosu

Review URL: https://codereview.chromium.org/1233453008

Cr-Commit-Position: refs/heads/master@{#338435}