Avoid uninitialized value warning in MemorySanitizer.

content/shell/renderer/test_runner/web_ax_object_proxy.cc

Index: content/shell/renderer/test_runner/web_ax_object_proxy.cc
diff --git a/content/shell/renderer/test_runner/web_ax_object_proxy.cc b/content/shell/renderer/test_runner/web_ax_object_proxy.cc
index 019f6415ce7550d7f29da85cc7a90e009f8f0b66..816549e14f2c050320ff00a68a0a9c5c0b50c6c6 100644
--- a/content/shell/renderer/test_runner/web_ax_object_proxy.cc
+++ b/content/shell/renderer/test_runner/web_ax_object_proxy.cc
@@ -1164,7 +1164,7 @@ int WebAXObjectProxy::WordStart(int character_index) {
   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;
@@ -1175,7 +1175,7 @@ int WebAXObjectProxy::WordEnd(int character_index) {
   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;