clang-format produced code that (choose all that apply): 
- Doesn't match Chromium style
- Riles my finely honed stylistic dander

clang-format uses 3 spaces between #else and an end-of-line comment.
From the style guide: "end-of-line comments should be separated from the code by 2 spaces"

Here's the code before formatting:
#if BUILDFLAG(ENABLE_FOO)
    DoFoo();
#else  // !BUILDFLAG(ENABLE_FOO)  <-- 2 spaces before comment
    DoBar();
#endif  // BUILDFLAG(ENABLE_FOO)

Here's the code after formatting:
#if BUILDFLAG(ENABLE_FOO)
    DoFoo();
#else   // !BUILDFLAG(ENABLE_FOO)  <-- 3 spaces before comment
    DoBar();
#endif  // BUILDFLAG(ENABLE_FOO)

Here's how it ought to look:
(The code before formatting.)

Code review link for full files/context:
This was noticed in https://codereview.chromium.org/2874833002/diff/20001/chrome/browser/ui/tab_contents/core_tab_helper.cc