Fix classes that have too many virtuals for inline constructors.

ui/gl/gl_context_stub_with_extensions.h

Index: ui/gl/gl_context_stub_with_extensions.h
diff --git a/ui/gl/gl_context_stub_with_extensions.h b/ui/gl/gl_context_stub_with_extensions.h
index d9da9d526177552f8d6e3d229246c31c71b81ebc..416ebe0401847b10d38dd6d2012599f4de2a6ef7 100644
--- a/ui/gl/gl_context_stub_with_extensions.h
+++ b/ui/gl/gl_context_stub_with_extensions.h
@@ -14,7 +14,7 @@ namespace gfx {
 // initialize GL extensions with, without actually creating a platform context.
 class GL_EXPORT GLContextStubWithExtensions : public gfx::GLContextStub {
  public:
-  GLContextStubWithExtensions() {}
+  GLContextStubWithExtensions();
   std::string GetExtensions() override;
 
   void AddExtensionsString(const char* extensions);