Make various string_util functions take StringPieces instead of char[].

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index 6bca11293b9b4ff5229ab9344c1c409cf4767630..8c32b5d14b5bed9018850b2cc80605960e8489a5 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -569,9 +569,8 @@ void ChromeRenderViewObserver::CaptureText(WebFrame* frame,
   // terminate the string at the last space to ensure no words are clipped.
   if (contents->size() == kMaxIndexChars) {
     size_t last_space_index = contents->find_last_of(base::kWhitespaceUTF16);
-    if (last_space_index == base::string16::npos)
-      return;  // don't index if we got a huge block of text with no spaces
-    contents->resize(last_space_index);
+    if (last_space_index != base::string16::npos)
+      contents->resize(last_space_index);
   }
 }