Created attachment 87153 [details] Patch Reviewed by NOBODY (OOPS!). Adding a "using namespace WebCore;" statement in a header may cause issues when <WebCore/Length.h> is included before <CoreText/CoreText.h>. Length.h defines the LengthType enum with a 'Fixed' value. CoreText.h includes MacTypes.h, which has a "typedef SInt32 Fixed;" statement, and then CoreText.h includes other headers that also use 'Fixed', but expect the typedef to be defined, not the enum. If another header includes "using namespace WebCore;" before CoreText.h, the following compiler errors result (paths abbreviated): CoreText.framework/Headers/SFNTLayoutTypes.h:689: error: reference to 'Fixed' is ambiguous MacTypes.h:184: error: candidates are: typedef SInt32 Fixed Length.h:37: error: WebCore::LengthType WebCore::Fixed SFNTLayoutTypes.h:689: error: 'Fixed' does not name a type * platform/mac/HTMLConverter.h: Use forward declaration of DocumentLoader class instead of including header. Remove the unused "using namespace WebCore;" statement. --- 2 files changed, 31 insertions(+), 3 deletions(-)