Move IME related functions from WebFrame to WebLocalFrame

content/renderer/text_input_client_observer.cc

Index: content/renderer/text_input_client_observer.cc
diff --git a/content/renderer/text_input_client_observer.cc b/content/renderer/text_input_client_observer.cc
index 3c953eebaad238155ab72433c28dbed90b5422e2..d738e546268b1c475692d022545a196e63586b95 100644
--- a/content/renderer/text_input_client_observer.cc
+++ b/content/renderer/text_input_client_observer.cc
@@ -87,13 +87,10 @@ void TextInputClientObserver::OnFirstRectForCharacterRange(gfx::Range range) {
   } else
 #endif
   {
-    blink::WebFrame* frame = webview()->focusedFrame();
-    if (frame) {
-      blink::WebRect web_rect;
-      frame->firstRectForCharacterRange(range.start(), range.length(),
-                                        web_rect);
-      rect = web_rect;
-    }
+    blink::WebLocalFrame* frame = webview()->focusedFrame();
+    blink::WebRect web_rect;
+    frame->firstRectForCharacterRange(range.start(), range.length(), web_rect);
+    rect = web_rect;
   }
   Send(new TextInputClientReplyMsg_GotFirstRectForRange(routing_id(), rect));
 }
@@ -102,11 +99,9 @@ void TextInputClientObserver::OnStringForRange(gfx::Range range) {
 #if defined(OS_MACOSX)
   blink::WebPoint baselinePoint;
   NSAttributedString* string = nil;
-  blink::WebLocalFrame* frame = webview()->focusedFrame()->toWebLocalFrame();
-  if (frame) {
-    string = blink::WebSubstringUtil::attributedSubstringInRange(
-        frame, range.start(), range.length(), &baselinePoint);
-  }
+  blink::WebLocalFrame* frame = webview()->focusedFrame();
+  string = blink::WebSubstringUtil::attributedSubstringInRange(
+      frame, range.start(), range.length(), &baselinePoint);
   std::unique_ptr<const mac::AttributedStringCoder::EncodedString> encoded(
       mac::AttributedStringCoder::Encode(string));
   Send(new TextInputClientReplyMsg_GotStringForRange(routing_id(),