[CSA] Remove an obsolette flag for Clang Static Analyzer.

That flag is now always enabled by default (https://reviews.llvm.org/D51251)
and the analyzer errors out when the flag is passed via command line.

Also adding myself as an owner for Clang Static Analyzer and Code Coverage
related files.

Bug: 901486, 759794
Change-Id: I54c9988c79f13287bb0580637d1a3ae4aa46bba7
Reviewed-on: https://chromium-review.googlesource.com/c/1330758Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608199}

build/toolchain/OWNERS

 dpranke@chromium.org
 scottmg@chromium.org
+
+# Clang Static Analyzer.
+per-file clang_static_analyzer*=mmoroz@chromium.org
+
+# Code Coverage.
+per-file *code_coverage*=mmoroz@chromium.org

build/toolchain/clang_static_analyzer_wrapper.py

@@ -25,7 +25,6 @@ analyzer_option_flags = [
     '-fdiagnostics-show-option',
     '-analyzer-checker=cplusplus',
     '-analyzer-opt-analyze-nested-blocks',
-    '-analyzer-eagerly-assume',
     '-analyzer-output=text',
     '-analyzer-config',
     'suppress-c++-stdlib=true',