Fixed a variable that may be used uninitialized.

Prevents a warning with GCC 4.8 on Android.

BUG=

Review URL: https://codereview.chromium.org/221873006

git-svn-id: svn://svn.chromium.org/blink/trunk@170675 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/css/parser/BisonCSSParser-in.cpp

@@ -329,7 +329,7 @@ static inline bool parseSimpleLength(const CharacterType* characters, unsigned l
 static bool parseSimpleLengthValue(MutableStylePropertySet* declaration, CSSPropertyID propertyId, const String& string, bool important, CSSParserMode cssParserMode)
 {
     ASSERT(!string.isEmpty());
-    bool acceptsNegativeNumbers;
+    bool acceptsNegativeNumbers = false;
 
     // In @viewport, width and height are shorthands, not simple length values.
     if (isCSSViewportParsingEnabledForMode(cssParserMode) || !isSimpleLengthPropertyID(propertyId, acceptsNegativeNumbers))