Avoid uninitialized value warning in MemorySanitizer.

content/shell/renderer/test_runner/web_ax_object_proxy.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/shell/renderer/test_runner/web_ax_object_proxy.h"
 
 #include "base/strings/stringprintf.h"
 #include "gin/handle.h"
 #include "third_party/WebKit/public/platform/WebPoint.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
@@ skipping 1146 matching lines @@
 void WebAXObjectProxy::ScrollToGlobalPoint(int x, int y) {
   accessibility_object_.updateLayoutAndCheckValidity();
   accessibility_object_.scrollToGlobalPoint(blink::WebPoint(x, y));
 }
 
 int WebAXObjectProxy::WordStart(int character_index) {
   accessibility_object_.updateLayoutAndCheckValidity();
   if (accessibility_object_.role() != blink::WebAXRoleStaticText)
     return -1;
 
-  int word_start, word_end;
+  int word_start = 0, word_end = 0;
   GetBoundariesForOneWord(accessibility_object_, character_index,
                           word_start, word_end);
   return word_start;
 }
 
 int WebAXObjectProxy::WordEnd(int character_index) {
   accessibility_object_.updateLayoutAndCheckValidity();
   if (accessibility_object_.role() != blink::WebAXRoleStaticText)
     return -1;
 
-  int word_start, word_end;
+  int word_start = 0, word_end = 0;
   GetBoundariesForOneWord(accessibility_object_, character_index,
                           word_start, word_end);
   return word_end;
 }
 
 std::string WebAXObjectProxy::Name() {
   accessibility_object_.updateLayoutAndCheckValidity();
   blink::WebAXNameFrom nameFrom;
   blink::WebVector<blink::WebAXObject> nameObjects;
   return accessibility_object_.name(nameFrom, nameObjects).utf8();
@@ skipping 108 matching lines @@
   v8::Handle<v8::Value> value_handle = gin::CreateHandle(
       isolate, new RootWebAXObjectProxy(object, this)).ToV8();
   if (value_handle.IsEmpty())
     return v8::Handle<v8::Object>();
   v8::Handle<v8::Object> handle = value_handle->ToObject(isolate);
   elements_.Append(handle);
   return handle;
 }
 
 }  // namespace content