FBTF: Move ctors/dtors into implementation files. Adds ctors/dtors to non-POD structs.

Cuts ~2MB off our .a files (Debug, Linux). Also added the "virtual" keyword on
a whole bunch of virtual dtors that were missing it.

BUG=none
TEST=compiles

Review URL: http://codereview.chromium.org/3522004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@61100 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/printing/print_settings.cc b/printing/print_settings.cc
index 98a9ebf..0950d63 100644
--- a/printing/print_settings.cc
+++ b/printing/print_settings.cc
@@ -31,6 +31,9 @@
       landscape_(false) {
 }
 
+PrintSettings::~PrintSettings() {
+}
+
 void PrintSettings::Clear() {
   ranges.clear();
   min_shrink = 1.25;