Disable linking chrome.dll on GN Windows.

TBR=dpranke

Review URL: https://codereview.chromium.org/890203002

Cr-Commit-Position: refs/heads/master@{#314081}

chrome/BUILD.gn

@@ -17,6 +17,8 @@ if (is_win && !link_chrome_on_windows) {
   # make targets work that depend on Chrome.
   group("chrome") {
   }
+  group("main_dll") {
+  }
 }
 
 if (!is_android && (!is_win || link_chrome_on_windows)) {
@@ -156,7 +158,8 @@ if (!is_android && (!is_win || link_chrome_on_windows)) {
   }
 }  # !is_android
 
-shared_library("main_dll") {
+if (!is_win || link_chrome_on_windows) {
+  shared_library("main_dll") {
     configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
     deps = [
@@ -234,6 +237,7 @@ shared_library("main_dll") {
       #}],
       # TODO(GYP) Lots of other stuff in the OS=="mac" block.
     }
+  }
 }
 
 # GYP version: chromium_browser_dependencies variable in chrome.gyp