Fix the warnings when build content/ with clang

content/renderer/android/content_detector.cc

Index: content/renderer/android/content_detector.cc
diff --git a/content/renderer/android/content_detector.cc b/content/renderer/android/content_detector.cc
index 96adfa3fb7ba2f76519e2aeb3b70a3053ffeb53d..64a91f2ce3c0dedae7c66aad38080877d773ac5f 100644
--- a/content/renderer/android/content_detector.cc
+++ b/content/renderer/android/content_detector.cc
@@ -14,6 +14,19 @@ using WebKit::WebSurroundingText;
 
 namespace content {
 
+ContentDetector::Result::Result() : valid(false) {}
+
+ContentDetector::Result::Result(const WebKit::WebRange& content_boundaries,
+                                const std::string& text,
+                                const GURL& intent_url)
+  : valid(true),
+    content_boundaries(content_boundaries),
+    text(text),
+    intent_url(intent_url) {
+}
+
+ContentDetector::Result::~Result() {}
+
 ContentDetector::Result ContentDetector::FindTappedContent(
     const WebKit::WebHitTestResult& hit_test) {
   if (hit_test.isNull())