Deinline even more destructors.

chrome/browser/dom_ui/dom_ui_screenshot_source.h

Index: chrome/browser/dom_ui/dom_ui_screenshot_source.h
diff --git a/chrome/browser/dom_ui/dom_ui_screenshot_source.h b/chrome/browser/dom_ui/dom_ui_screenshot_source.h
index 8cd8b2c8554c7b07dbba7d28406f320e7cc0eb7b..3a9aafcb3cac95830d53a4cea17a64b78fd68e0a 100644
--- a/chrome/browser/dom_ui/dom_ui_screenshot_source.h
+++ b/chrome/browser/dom_ui/dom_ui_screenshot_source.h
@@ -27,11 +27,7 @@ class DOMUIScreenshotSource : public ChromeURLDataManager::DataSource {
                                 bool is_off_the_record,
                                 int request_id);
 
-  virtual std::string GetMimeType(const std::string&) const {
-    // We need to explicitly return a mime type, otherwise if the user tries to
-    // drag the image they get no extension.
-    return "image/png";
-  }
+  virtual std::string GetMimeType(const std::string&) const;
 
   std::vector<unsigned char> GetScreenshot(const std::string& path);