build: Remove enabled-by-default check-implicit-copy-ctors flag.

This flag is now enabled by default, so we don't need to specify it.
Remove it from the build files.

R=thakis@chromium.org

Review-Url: https://codereview.chromium.org/2260913002
Cr-Original-Commit-Position: refs/heads/master@{#413459}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 113b383d7cc3abfd48e4d8a6c318dc6c50d57d3f

common.gypi

@@ -2225,8 +2225,7 @@
             }],
           ],
           'clang_plugin_args%': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-templates '
-          '-Xclang -plugin-arg-find-bad-constructs -Xclang follow-macro-expansion '
-          '-Xclang -plugin-arg-find-bad-constructs -Xclang check-implicit-copy-ctors ',
+          '-Xclang -plugin-arg-find-bad-constructs -Xclang follow-macro-expansion ',
         },
         # If you change these, also change build/config/clang/BUILD.gn.
         'clang_chrome_plugins_flags%':

config/clang/BUILD.gn

@@ -43,10 +43,6 @@ config("find_bad_constructs") {
       "-plugin-arg-find-bad-constructs",
       "-Xclang",
       "follow-macro-expansion",
-      "-Xclang",
-      "-plugin-arg-find-bad-constructs",
-      "-Xclang",
-      "check-implicit-copy-ctors",
     ]
 
     if ((is_linux || is_android) && !is_chromecast) {