Unbundle Flash on Linux.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index b3a7b8c3356400bd6d5a2af4a4af065e200c1d9e..af2d2f0cbfa4276404ccabbe45c894ed79fd834e 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -257,10 +257,10 @@ if (!is_android && !is_mac) {
     ]
     deps += [ "//components/startup_metric_utils/browser:lib" ]
 
-    # Precompiled plugins that need to get copied to the output directory.
-    # On Mac, internal plugins go inside the framework, so these
-    # dependencies are on chrome.dll. On Windows, these are not bundled.
-    if (!is_win) {
+    # Only ChromeOS has precompiled Flash that needs to get copied to the output
+    # directory. On other platforms, Flash is either component-updated only or
+    # not supported at all.
+    if (is_chromeos) {
       deps += [ "//third_party/adobe/flash:flapper_binaries" ]
     }