Combine PDF plugin into the Chromium binary.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index f4414af23fb420bfe2c67a66a2bdd0384348175c..d9d87eebd16a980b1ac423ed71d1e85707bfead6 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -111,10 +111,8 @@ if (!is_android) {
       # TODO(GYP) some stuff from GYP including chrome_multiple_dll.
     }
 
-    if (!is_mac) {
-      # On Mac this is done in chrome_dll.gypi.
-      datadeps += [ "//pdf" ]
-      # TODO(GYP) pdf linux symbols
+    if (enable_plugins) {
+      deps += [ "//pdf" ]
     }
   }
 }  # !is_android
@@ -197,6 +195,10 @@ shared_library("main_dll") {
     #}],
     # TODO(GYP) Lots of other stuff in the OS=="mac" block.
   }
+
+  if (enable_plugins) {
+    deps += [ "//pdf" ]
+  }
 }
 
 # GYP version: chromium_browser_dependencies variable in chrome.gyp